ML20002E126

Forwards Results of Sleeved Control Element Assembly Guide Tube Evaluation,In Response to NRC 791119 Request.Insps Show No Indication of Sleeve Wear After Two Cycles.Recommended Insp Program Encl

ML20002E126
Person / Time
Site:	Calvert Cliffs
Issue date:	01/21/1981
From:	Lundvall A BALTIMORE GAS & ELECTRIC CO.
To:	Clark R Office of Nuclear Reactor Regulation
References
NUDOCS 8101260477
Download: ML20002E126 (3)

Text

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e B ALTIMORE G AS AND ELECTRIC COMPANY P.O. BO X 147 5 B ALTIM O R E. M A R YL AN D 21203 ARTMun E. LuMOVALL,JR.

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January 21, 1981 Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Comission Washington, D. C.

20555 ATTENTION: Mr. Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit No. 2, Docket No. 50-318 Sleeved CEA Guide Tube Evaluation Program

REFERENCE:

(a) NRC Letter from R. W. Reid to A. E. Lundvall dated November 19, 1979 (b) BG&E Letter from A. E. Lundvall to R. A. Clark dated January 21, 1981 ENCLOSURE: (1) Guide Tube Wear Related Exams at Calvert Cliffs Unit No. 2 Gentlemen:

Reference (a) issued the safety evaluation documenting the acceptability of Cycle 3 operations of Calvert Cliffs Nuclear Power Plant No. 2 (CCNPP2).

This amendment authorized operation with sleeved CEA guide tubes, but noted the need for further evaluation, including an inspection at the end of Cycle 3.

Recent inspections of Unit 1 CEA guide tubes has shown no indication of sleeve wear after two cycles (Reference (b)).

Consec.uently, no CEA guide tubes are planned to be inspected in this outage. The CEA inspections are detailed in Enclosure (1).

If you have any ouestions, please do not hesitate to call.

Very truly yours, A. E. Lundvall, Jr.

Vice President - Supply D\\

AEL: JAM:st I

810 1260471

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i Office of. Nuclear Reactor Regulation January 21, 1981 i

Page 2 l

Copy to:

J. A. Biddison, Esquire (w/o Encl)

G. F. Trowbridge, Esquire (w/o Encl)

Messrs. E. L. Conner, Jr. - NRC 1

P. W. Kruse

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Recommended Inspection Procram for Calvert Cliffs 2, EOC3 A.

CEA surveillance Program o Eddy Current Examination of three CEAs to characterize wear.

These results may then be compared with similar data obtained following Cycle 2 to evaluate the effects of an additional operating cycle. The 3 CEAs selected for this exam are:

CEA ID CEA Bank In Cycle 3 Assembly Al C

E029 D4 C

E034 C0 A

E103 o Visual inspection (by TV) of the lower 24 inches of CEA A1.

This CEA after Cycle 2 exhibited ti,e largest wear signals of any CEA tested to date.

Since the three CEA's involved in the exani1ation program described above will be returned to the core for Cyc'a 4 operation, the recom-mended inspections will have to be perfunned during fuel shuffling.

s B.

PROTOTYPE CEA Examination The proposed inspections for this CEA are as follows:

o Eddy currant testing for evidence of wear.

o Visual examination by TV with a video tape recording o Profilometry of each finger.

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