ML20081A234

Forwards Rept on Task 05088,Pressurizer Relief Valve Discharge Piping Qualification for Calvert Cliffs,Unit 2, Per TMI Item II.D.1

ML20081A234
Person / Time
Site:	Calvert Cliffs
Issue date:	02/29/1984
From:	Lundvall A BALTIMORE GAS & ELECTRIC CO.
To:	John Miller Office of Nuclear Reactor Regulation
Shared Package
ML20081A236	List: ML20081A234 ML20081A240 ML20081A251
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.D.1, TASK-TM NUDOCS 8403050098
Download: ML20081A234 (3)

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/BALTI MORE GAS AND ELECTRIC CHARLES CENTER P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ARTHUR F., LUNDVALLi JR.E '

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sum Director of Nuclear Reactor R'egulation Attention: Mr. 3. R. Miller, Chief Operating Reactors Branch #3 Division of Licensing U.S. Nuclear Regulatory Commission

~ Washington, D.C. 20555 Subj2ct: Calvert Cliffs Nuclear Power Plant Units Nos. 2; Dockets Nos. 50-318 Performance Testing of Safety and Relief Valves Gentlemen:

Action Item II.D.I.of NUREG-0737 required all utilities to demonstrate that pressurizer safety and relief valves will open and shut under expected flow conditions. It further required determination of the effects,if any, of safety and relief valve discharge piping reactions on safety and relief valve operability. Reports certifying valve operability and analyzing discharge pipe effects are now complete for Unit 2. 'Ihe purpose of this letter is to transmit these reports and to outline our plans for completing certain pipe support modifications.

The operability of the Unit 2 safety and relief valves has been adequately demonstrated based on a combination of applicable test data and analysis. In addition, conservative analysis of safety and relief valve discharge piping indicates that all design load stresses on piping and fittings are velthin allowable limits.

Tne analysis results also indicate that 9 of the 84 existing pipe supports may experience stresses that exceed code allowables with the potential for minor deformation; however, this deformation would not affect safety and relief valve operability. Our review of the analysis results and methodology have led us to believe

_that although an analysis using less conservative methodology would yield resultant strest,es within the acceptable range. such an effort would not be cost effective.

Consequently, we have decided in this case to modify the 9 supports to increase their strength. In addition, it has been determined that one snubber may be eliminated and two others replaced with strut assemblies. These modifications will be performed concurrent with the strengthening of the supports discussed above.

_ Field engineering to determine the optimum method of pipe support mo'dification will be completed during the scheduled Spring,1984 outage. Actual modification of'the supports will be completed during the next regularly scheduled ou'tsge for. Unit,2 (Fall 1985).

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Mr. J. R. Miller February 29,1984 If you should have any questions, please do not hesitate to contact us.

Very truly yours,

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Enclosures:

1. Pressurizer Relief Valve Discharge Piping Qualification for Unit No. 2, Calvert Cliffs Nuclear Power Plant, Bechtel Report on Task 05088, dated Febntary 14,1984

2. Calvert Cliffs Units I and 2 Pressurizer Safety Valve Operability Report, CEN-248(B) Rev 2, dated January 1984.

cc: all w/o enclosures

3. A. Biddison, Jr. Esq.

G. F. Trowbridge, Esq.

Mr. D. H. Jaffe, NRC Mr. R. E. Archtizel, NRC

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-Mr. 3. R. Millsr - 3 February 29,1984

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Messrs. ' C. H. Poindexter V. F. Stricklin (3)

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