Calvert Cliffs (USA)

Map of Calvert Cliffs

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2 * 850 MW PWR units constructed by CE in operation since 1975/76

Facilities in Calvert Cliffs

plantreactor typconstruction startoperation startshut down
Calvert Cliffs-1PWR19681975
Calvert Cliffs-2PWR19681976
1998-07-01

Anti-nuclear groups and some citizens living near Baltimore Gas & Electric´s Calvert Cliffs NPP urged NRC officials, at a public meeting last week, to deny BG&E´s bid to renew its operating license.

The Sierre Club´s Appalachian regional office argued that BG&E was simply seeking a license extension as a way to pay for a planned $300-million SG replacement project and nearly $1-billion in stranded investment costs.
Several citizen groups and individuals questioned why BG&E was applying to renew the licenses 16 and 18 years before they expire (unit 1´s license terminates in 2014 and unit 2´s in 2016) and urged the company to spend the next decade searching for ways to replace the capacity with renewable energy sources.

The Federation of Southern Calvert Communities talked about the residents´ reliance on BG&E´s $20-million tax contribution to the county and economic benefits of the company´s 1,400-person work force, most of whom live in Calvert County.

Public Citizen´s was concerned that the NRC does not intend to review plants´current licensing basis as part of the relicensing review process. Only aspects of plant aging are addressed in the licensing review. Riccio asserted, "The reality is NRC knows no plant meets its current licensing basis."
The Maryland Public Interest Research Group argued BG&E would "rob consumers" if the Maryland Public Service Commission granted the company´s July 1 filing requesting to recoup $911-million in so-called stranded costs. The Sierra Club also questioned whether BG&E would be seeking renewal if it did not have to amortize SG replacement costs.
An article for Nuclear Engineering International said that the plant would have to shut down early - by around 2005 - if the SGs are not replaced. "Premature shutdown leaves BG&E with the stranded investement in the plant and about $300-million short on its decommissioning fund.

1998-06-20

Baltimore Gas & Electric Co. (BGE) expects to have four new SGs installed at Calvert Cliffs by 2003 in a $300-million project that is the single largest modification in the plant's history.

BGE decided to replace them because it has applied to renew the two nuclear units operating licenses and wants to run them for 20 additional years. The current licenses expire in 2014 and 2016.

However, fewer than 800 tubes per SG are plugged and none are sleeved, so far, the company said. Each generator has 8,500 tubes.

Replacements will be done during regular refueling, at unit 1 in 2002 and unit 2 in 2003, and the outages are supposed to last about 75 days for each unit. BGE hasn't decided whether to store the old generators on site or ship them to a low-level radwaste disposal facility.

SGT Ltd. completed SG replacements at Florida Power & Light Co.'s St. Lucie-1 earlier this year and at Wisconsin Electric Power Co.'s Point Beach-2 last August.

1998-04-01

Baltimore Gas & Electric (BG&E) submitted its application to extend the license for Calvert Cliffs. That application was the culmination of an eight-year investigation of technical and environmental issues.
To prepare the application, BG&E spent about $7-million.
The utilityexpect to spend roughly an equal amount for the NRC application review.
The price for license renewal does not include equipment upgrades or refurbishment.
BG&E has committed to invest $300-million in four new SGs for its two 845-MW Combustion Engineering reactors.

1991-01-01

Loss of RHR: During pre-operational testing an operators's fault led to the spray of a couple of thousand liters of water in the containment; RHR was being provided by a low pressure safety injection pump and two shutdown heat exchangers. Workers were linking up the valves to fill one of the SI tanks but inadvertantly established a flow path from the low pressure safety injection pump to the motor-operated isolation valve of the containment spray header.

1990-12-06

Undersized fuses in safety related motor control circuits could prevent various safety related motors from opeerating during accident condition, condition existed since initial oparation.

1990-12-06

Undersized fuses in safety related motor control circuits could prevent various safety related motors from operating during accident condition, Condition existed since initial operation.

1990-12-04

Cracks were found on a socket weld on top of two different SI tanks.

1990-07-10

Design change error existed since 1982. Cable supporting the operation of both EDGs were routed through the unit-1 electric equipment room. Fire in this room could prevent EDGS from supplying power to either emergency bus.

1990-04-06

Inadequate LOCA procedure did not ensure a post LOCA core flush would occure in time to prevent boron precipitation. This could have resulted in degraded core cooling because of clogged coolant channels.

1990-04-06

Inadequate LOCA procedure did not ensure a post LOCA core flush would occure in time to prevent boron precipitation, Could have resulted in degraded core cooling because of clogged coolant channels.

1990-01-30

RHR heat exchangers´capacity not ensured. shell side flowrates above 9500 lit/min induce severe tube vibration.

1990-01-30

RHR heat exchangers´capacity not ensured. Shell side flowrates above 95000 liters/min induce severe tube vibration.

1989-11-06

Many AOVS and piston operated dampers which utilize safety related accumulators would not have performed as expexted after a loss of instrument air; Systems that were potentially inoperable: ESW,AFW, EDG cooling, ECCS.

1989-08-22

Leakage in pressurizer heater sleeves: all 125 sleeves have to be replaced to repair or avoid cracks; leaks are caused by IGSCC, same problem in unit-1. All PRZ heater sleeves were replaced.Failure of a sleeve could result in small break LOCA.

1989-05-01

Leakage in pressurizer heater sleeves: All 125 sleeeves had to be replaced to repair or avoid cracks. Leaks are caused by IGSCC, same problem in unit-2.

1989-03-01

Turbine driven feed pump throttle trip valve failure with resulting control room fire.

1988-04-14

Air system regulators could fail overpressurizing solenoid operated pilot valves which causes various safety related air operated valves to not fail safe.

1988-04-14

Air system regulators could fail overpressurizing solenoid operated pilot valves which causes various safety related air operated valves to not fail safe.