ML20076D247

Informs That Implementation of Overfill Protection Sys Being Held in Abeyance Until NRC Completes Review of C-E Owners Group Concerns Re Cost/Benefit Ratio Associated W/ Recommendations of Generic Ltr 89-19,USI A-47

ML20076D247
Person / Time
Site:	Calvert Cliffs
Issue date:	07/19/1991
From:	Creel G BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-GTECI-A-47, REF-GTECI-SY, TASK-A-47, TASK-OR GL-89-19, NUDOCS 9107260149
Download: ML20076D247 (2)

Text

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. S ALTIMORE OAS AND ELECTRIC CHARLES CENTER

• P.O. BOX 1475

• BALTIMORE, MARYLAND 21203 1475 GeoRot C CRett j

- vice paesicco ,

NvCat an ihE4GT 1300 re o-4 a st July 19,1991 U. S. Nuclear Regulatory Commission Washington, D'? 20555 AITENTION: Document Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2: Docket Nos. 50-317 & 50-318

_ Generic Letter 89-19. Unresolved Safetv Issue A-47

REFERENCES:

(a). Generic Letter 89-19, Request for Action Related to' Unresolved Safety Issue A-47, " Safety Implication of Control Systems in LWR Nuclear Power Plants" Pursuant to 10 CFR 50.54(1)

(b) Letter from Mr. G. C. Creel (BG&E) to NRC Document Cottrol Desk, dated March 19, 1990, Response to Generic Letter 8919, Unresolved Safety Issue A-47 (c) Letter from Mr. J. J. Ilutchinson, (Combustion Engineering Owners Group (CEOG)] to Mr. S. Newberry (NRC), dated October 31,1990, NRC Generic Letter 89-19, CEOG Concerns Regarding Steam Generator Overfill Protection (SGOP)

Gentlemen:

In our March 19,1990 response (Reference b) to the recom iendationc of Generic Letter 8919 (Reference a), we stated that a steam generator feed pump tag would be installed in both Calvert Cliffs Units to provide a separate and independent steam gen :rator overfill-protection system that would serve to mitigate main feedwater overfeed events.

. Subsequent to that submittal, on November 20,1990, members of the Combustion Engineering

- Owner's Group (CEOG) met with the NRC staff to discuss the Generic Letter's recommendation to install an automatic feedwater pump trip system. CEOG questioned u e cost / benefit ratio associated with the recommended hardware change in light of recent data that indicated steam generator overfill to be a low risk event with no real safety significance (Reference c). The CEOG also questioned the lack of safety assessment regarding the negative impact of a spurious feedwater pump trip and loss of feedwater. The NRC staff stated that it would review and evaluate the information presented to them. The NRC staff also recommended that the implementation of any overfill protection system he placed on hold pending the completion of this evaluation. pp YY 9107260149 910719 _

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. Document Control Desk Jttly 19,1991 Page 2 This letter is to inform you that the implementation of this system at Calvert Cliffs is being held in abeyance until such time that the NRC staff completes the review of CEOG's concerns and communicates further instruction. Baltimore Gas and Electric Company will then reevaluate its pos; tion and take appropriate action. Should you have any further questions regarding this matter, we will be pleased to discuss them with you.

Very truly yours,

/

/

/ ~. . l Y {!-

- t GCC/GT/gt/ dim l cc: D. A. Brune. Esquire J. E. Silberg, Esquire R. A. Capra, NRC D. G. Mcdonald, Jr., NRC T T. Martin, NRC L E. Nicholson, NRC R.1. McLean, DNR J. II. Walter, PSC

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