ML20237G265

Advises That All Plant Seismic Upgrades Complete W/ Exception of Replacement of Safety Class Batteries 2 & 4 Which Will Be Reviewed as Part of 10CFR50.59 Insp After Installation

ML20237G265
Person / Time
Site:	Maine Yankee
Issue date:	08/31/1987
From:	Sears P Office of Nuclear Reactor Regulation
To:	Randazza J Maine Yankee
References
NUDOCS 8709020172
Download: ML20237G265 (2)

Text

1 August 31, 1937 l A

Docket No.: 50-309 l

Mr. J. B. Randazza Executive Vice President l Maine Yankee Atomic Power Company i 83 Edison Drive {

Augusta, Maine 04336 i

Dear Mr. Randazra:

l

SUBJECT:

AUDIT OF PLANT CHANGES (10 CFR 50.59) FOR MAINE YANKEE ATOMIC  !

POWER STATION (MYAPS) SETSMIC UPGRADES By letter dated February 26, 1087, Maine Yankee Atomic Power Company (MYAPCo) indicated that the seismic upgrades listed below would be completed by the scheduled completion dates, also listed below. By pushing the construction ,

schedule forward, the completion date for the Refueling Water Storage Tank I anchorage upgrade was implemented approximately 18 .nonths earlier than promised.

Description Schedule Completion

( Change Date Diesel fuel day tank anchorage upgrade done Control Room cooler anchorage upgrade done l Welding cart / gas bottle tiedown done Security lighting tiedown done Main control board alarm tiedown done Strengthen blockwall VE 21-1 1987 Outage (done)

Upgrade anchors for fans 44A & B 1987 Outage (done)

Install internal anchors for transformers 507 & 608 1987 Outage (done)

Replace safety class batteries 1 & 3 1987 Outage (done)

Replace safety class batteries 2 & 4 19PS Outage Replace water storage tank anchorage upgrade 1988 Outage (done)

By letter dated March 26, 1987, the staff indicated that those seismic upgrades i listed would be reviewed during a 10 CFR 50.59 inspection. Also in that letter, the staff indicated that with these upgrades, the High Contidence of Low Probability of Failure (HCLPF) capacity of MYAPS is in the range of .279 ,

well above any hypothesized earthquake for K APS. In that letter it was also  :

stated that "all the issues associated with the design basis for MYAPS and  !

hence the design adequacy of the plant are considered resolved." The March 26, i

1987 letter was the culmination of an NRC-sponsored Seismic Design Margins Program (SDMP), a joint NRR/RES program, the purpose of which was to evaluate the seismic ruggedness of MYAPS. SDMP found, that with the previously listed upgrades, MYAPS did in fact have HCLPF of .279 e709020172 B70831 9 PDR ADOCK 0500 s.

l l August 31, 1937

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Design packages for the above items were reviewed and found to be completed and technically acceptable. All of the items previously listed were physically inspected for proper installation according to construction drawings and/or instructions. A complete walkdown showed completed installatico of all items except the replacement of safety class batteries 9 and 4, which are scheduled for replacement during the 1988 refueling outage.

A check of records showed proper quality control during installation and use of correct n'aterials. The Refueling Water Storage Tank upgrade packace included detailed, sequenced instructions for welding various members and the pretorque of anchor bolts after the chair installations, l

All of the above listed items are considered complete with the exception of the replacement of safety class batteries P and 4 which will be reviewed as part of a 10 CFR 50.59 inspection after their installation.

Sincerely, h

Patrick M. Sears, Project Manager Project Directorate I-3 i

\ .

Division of Reactor Projects, I/II cc: See next page i DISTRIBUTION:

. Docket File EJordan NRC PDR JPartlow l

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NAME :PSears:lm :VEeses  :

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DATE:088/87 :0861/87 :08M /87  :  :

0FFICIAL RECORD COPY l

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