ML20055G998
| ML20055G998 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/20/1990 |
| From: | Creel G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-66457, NUDOCS 9007250033 | |
| Download: ML20055G998 (2) | |
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B ALTIMORE OAS AND ELECTRIC CHARLES CENTER
- P.O. BOX 1475
- BALTIMORE, MARYLAND 21203-1475 OtoRoc C CRtcL Vect PatstotNi Nvettam rNERGY (300 #40 446B July 20,1990 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Response to Request for Additional Irformation Regarding Control Element Assembly (CEA)- Failure at Mai.ag yankee (TAC 66457)
REFERENCE:
(a) Letter from Mr. R. A. Ca:n (NRC) to. Mr. G. C. Creel (BG&E),
dated July 6 1990, Generic. Implications and Resolution of CEA Failure at 1. aine'.~ Yankee : for. _Calvert Cliffs, Unit Nos. 1 - and 2, TAC 66457 4
Gentlemen:
i On June 7, 1990, while. conducting' functional testing $f the' control element assemblies (CEA)at Maine Yankee, it - was discovered that one CEA could not be fully inserted into the core.
Subsequent investigation concluded ' that it is most likely that-irradiation assisted stress corrosion' cracking led to' CEA failure.
The failure 3
mechanism is only applicable to the older Combustion Engineering CEA - (14 x 14) design.
Calvert Cliffs Unit I has no old (14 - x 14) design CEAs installed and there are no plans to use them. in the future. Thus, the problem is not applicable : to Unit -1.
Calvert Cliffs Unit 2 currently has 68 CEAs of the 14 x 14 design installed.
Reference (a) notes that Baltimore Gas and. Electric (BG&E) Company intends to
,l' implement an Action Program to address the. continued use of the CEAs currently installed in Unit 2.
Additionally, Reference -(a) requests additional information j
regarding the' Action Program.
L l,/'
9007250033 900720 fDR ADOCK 05000317 i
PDC i.
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Document Control Desk Jb,1y 20,1990
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.The current plans for Unit 2 are to eventually replace all 68 CEAs. New C';W have been ordered from the vendor and may be received as ently as the end of Oct:,?.,,.
199.).
Should the vendor delivery schedule not support the Unit 2 restart and should analysis support safe continued use of the old CEAs, we will respond to the Reference (a) questions at least 60 days prior to the scheduled Unit 2 restart.
It is our understanding that delaying our response to - the questions is acceptable to the NRC Staff given that Unit 2 is currently in a refueling outage, and that there is a r;ssibility that the old style CEAs may not be reused. Unit 2's restart is currently scheduled for late 1990.
i Should you have any further questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours, M+
G. C. Creel ice President - Nuclear Energy GCC/JMO/ dim 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. I. McLean, DNR i
l I
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