ML17298B353

Provides Clarification of Justification of 840607 Request for Partial Exemption from GDC-4.Request Restricted to Portion of GDC-4 Requiring Protection Against Effects Re Postulated RCS Main Loop Piping

ML17298B353
Person / Time
Site:	Palo Verde
Issue date:	10/03/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Knighton G Office of Nuclear Reactor Regulation
References
ANPP-30736-EEVB, NUDOCS 8410170269
Download: ML17298B353 (6)

Text

REGULATOR INFORMATION DISTRIBUTION S

'TEtl (RIDS)

ACCESSION NBR: Stl10170269 DOC ~ DATE: 80/10/03 NOTARIZED:

NO

..FACIL:STA 50 528 Palo Verde Nuclear Station~

Unit 1~ Arizona Publi STN-50-529 Palo Verde Nuclear Station~

Unit 2~ Arizona Publi STN-50-530 Palo Verde Nuclear Station~

Unit 3~ Arizona Publi AUTH ~ NAhlE, AUTHOR AFFILIATION VAN BRUNTiE,E.

Arizona Public Service Co.

RECIP ~ NAME REC IP IENT AFFILIATION KNIGHTONp G ~

Licensing Branch 3

SUBJECT:

Pr ovides clarification of Justification of 800607 request for par tial exemption from GDC-tt ~ Request r estricted to portion of GDC-0 r equir ing protection against ef fects r e postulated RCS main loop piping.

DISTRIBUTION CODE e B001D COPIES RECEIVED-'LTR ENCL SIZE:

TITLE: Licensing Submittal:

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Arizona Public Service Company October 3, 1984 ANPP-30736 EEVBJr/MAR/dh Director of Nuclear Reactor Regulation Attention:

Mr. George Knighton, Chief Licensing Branch No.

3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2 and 3

Docket Nos. STN-50-528/529/530 Request for Partial Exemption to GDC4 File:

84-056-026'.l.01.10

References:

(A) Letter ANPP 29684-EEVB/WFQ, E.

E.

Van Brunt, Jr.

to G.

Knighton, Request for Partial Exemption to GDC4, dated June 7, 1984 (B) Letter ANPP 30440WFH/MAR, E.

E.

Van

Brunt, Jr.

to G. Knighton, dated September 5,

1984 (C) Letter LD-83-108, A. E. Scherer to D.

G. Eisenhut, Basis for Design of Plant Without Pipe Whip Restraints, dated December 23, 1983

Dear Mr. Knighton:

In our Reference (A) and (B) letters, Arizona Public Service (APS) submitted justification for partial exemption from General Design Criteria 4 (GDC4).

In response to a verbal request by NRC staff, APS provides the following clarification to our Reference (A) and (B) submittals.

Reference (A) cites a

fracture mechanics

analysis, submitted by Combustion Engineering (CE) in Reference (C),

which validates the "leak before break" failure scenario for the System 80 design.

The analysis was performed on the PVNGS design (as the prototypical System 80 plant) using pertinent PVNGS parameters, therefore, the Reference (C) submittal envelopes PVNGS with respect to such parameters as

loads, material properties, postulated crack leakage and size, sei.smicity, and leak detection system capabilities.

We emphasize that our exemption request is restricted at this time to that portion of GDC4 which requires protection against the effects associated with postulated RCS main loop piping.

We do not intend to change the RCS component support design.

8410170269 84i003 PDR

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In Reference (A) we indicated this exemption pertains to all postulated breaks specified in Section 3.6 of

CESSAR, which would eliminate the need for 22 main loop whip restraints per unit (66 for 3 units).

We indicated the exemption would result in an estimated 560 man-rem per unit reduction in radiation exposure over the life of the plant.

This estimate is based on the following assumptions:

a)

A radiation level of 100 mRem/hr.

This is slightly conservative with respect to the CESSAR estimate of 70-250 mRem/hr next to the RCS piping.

b) 400 man-hours to remove and reinstall a pipe whip restraint for Inservice Inspection.

This estimate is based on construction and pre-operational testing records.

c) 14 of the 22 restraints would, at some time during the life of the plant, be removed to eliminate interference with Inservice Inspection (ISI).

Considering the evolutionary nature of ISI, an estimate of 14 interferences over a

40 year life is considered conservative.

As indicated in our previous submittals, an expeditious review of our exemption request will result in substantial saving to APS.

Please contact us if you have any further questions.

Very truly yours, CU~

E. E.

Van Brunt, Jr.

APS Vice President Nuclear Production ANPP Project Director EEVBJr/HAR/dh cc:

E. A. Licitra A.

C.

Gehr

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