ML17297B728

Requests NRC Review Results of PWR Design Analyses to Approve Removal of Pipe Whip Restraints.Meeting W/Nrc to Discuss Request & Facilitate Exchange of Info & Questions Suggested

ML17297B728
Person / Time
Site:	Palo Verde
Issue date:	10/14/1982
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Novak T Office of Nuclear Reactor Regulation
References
ANPP-22020-WFQ, NUDOCS 8210190717
Download: ML17297B728 (6)

Text

REGULATOR'FORMATION DISTRIBUTION S

EM (RIDS) s AOCESSION NBR'8210190717 DOC ~ DATE'2/10/14 NOTARIZED; NO FACIL:STN 50 528 'Palo Verde Nuclear Station<

Uni,t ii Arizona Publi STN.50+529 lpalo Verde Nuclear Station~

Uni,t 2~ Arizona Publi STN 50;530 Palo Verde Nuclear Station~

Uni,t 3i Ar izona Publi AUTH ~ NAME AUTHOR AFFILIATION VAN BRUNTiE ~ 6, Arizona Public Service:Co,

<<RE<<C IP ~ NAME RECIPIENT AFFILIATION NOVAKp.T,MD Assi stant Di r ec tot for Licensin'g S UBJECT: Requests NRC review results of PWR design analyses to approve -removal of pipe whip restraint<<st Meeting w/NRC to discuss request K faciliitate exchange of info K questions suggested'ISTRIBUTION CODE ~

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'HOENIX'RIZONA65036 October 14, 1982 ANPP-22020 - NFQ/TFQ Mr. Thomas Novak Assistant Director for Licensing Division of Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.

205SS

Subject:

Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2 and 3

Docket Nos. STN-50-528/529/530 File:

82-056-026; G.l;01.10

Reference:

NUREG/CR-2189, "Probability of Pipe Fracture in the primary coolant loop of a PNR plant", dated September, 1981.

Dear Mr. Novak:

The design basis for PVNGS Units 1, 2 and 3 includes the postulation of guillotine

" pipe breaks in the Reactor Coolant System (RCS) main loop piping.

Recent analy-ses, the referenced report, of lItestinghouse PllfRIs have shown that:

1.

The probability of guillotine failures are extemely small

( 10

)

2.

A through-the-wall crack of detectable size will remain stable when subjected to an SSE.

A probabilistic analysis of the PVNGS RCS is being conducted by Lawrence Livermore Laboratories (LLL) to define the probability of a guillotine rupture."

Ne have furnished LLL with information related to the design and expected loads on the RCS and our seismic consultant, ERTEC, is developing a site specific seismic hazard, curve.

This seismic hazard curve is expected to be complete and trans-mitted to LLL by October 31, 1982.

It is expected that LLL'illcomplete their analyses on PVNGS by December, 1982.

Favorable results from this analysis is

expected, similar to the results of the referenced report.

This may justify the elimination of the double-ended guillotine break of RCS piping from the PVNGS design basis, which would dismiss the need for RCS pipe whip restraints.

These restraints require substantial maintenance, surveillance and adjustment efforts during the in-service inspection program, which creates a substantial radiation exposure hazard'o personnel performing these tasks.

These restraints are also extensive and expensive to manufacture and install. If justified by the LLL

analysis, we would very much consider removing them from the PVNGS design.

7 82101 821019071705000528 OR

POOCH, POR 4

PIIO~

I Vti l

Mr. T. Novak October 14, 1982 ANPP-22020 - ifFQ/TFQ Page 2

The construction status of the restraints is shown below:

UNITS STATUS Installed, Unadjusted Machining of saddles to start November, 1982 Machining of saddles to start January, 198S Ne feel, from results of previous analyses on other Pl<R designs, the LLL analysis for PVNGS will justify. elimination of these restraints from the design basis.

-l<e request that the NRC review the results of LLL analyses as soon as they are available, so that you can approve the removal of the restraints from the PVNGS design.

Ne request a meeting with the appropriate members of the NRC staff, as discussed with R. Bosnak, Chief, Mechanical Engineering Branch, on October 20, 1982, to discuss this request and to facili-tate an exchange o'f information, and any additional questions the NRC staff may have on this matter.

Very truly your,

E.

E. Van Brunt, Jr.

APS Vice President, Nuclear Projects ANPP Project Director EEVBJr/TFQ/sp cc:

E. Licitra R.

Bosnak L. Bernabei P.

L. Hourihan A. C.

Gehr

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