ML20155F413

Forwards Safety Evaluation Supporting Util Compliance W/Atws Rule 10CFR50.62, Requirements for Reduction of Risk from ATWS Events for Light-Water-Cooled Nuclear Power Plant

ML20155F413
Person / Time
Site:	Millstone
Issue date:	10/06/1988
From:	Boyle M Office of Nuclear Reactor Regulation
To:	Mroczka E NORTHEAST NUCLEAR ENERGY CO.
Shared Package
ML20155F418	List: ML20155F413 ML20155F421
References
TAC-68494, NUDOCS 8810130257
Download: ML20155F413 (3)

Text

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OCT eI tm Cocket fio.: 50-245 , DISTRIBUTION 1 Docket mi~ OGC Mr. Edward J. Mroczka NPC & Local PORs EJordan Senior lice President Gray File BGrires Nuclear Engineering and Operttiens SVarga ACRS(10) flertheast Nuclear Energy Cu pany BEoger Post Office Box 270 Sf: orris Partford, Connecticut 00141-0?70 MBoyle

Dear Mr. Mroczka:

SURJECT: SAFE 1Y EVALUATION ON ATWS ROLE 10 CFR 50.62 (TAC #68494)

Fe: Millstcne Nuclear Pcwer Station, Unit No.1

^

The ATW5 Rule (10 CFR 50.62, "Requirerents for Ptduction of Risk from Anticipated Transients Without scram (ATUS) Events for Light 4 ater-Ccoled Nuclear Power Plant") requires irproverents in the design and operation of corrercial nuclear power facilities to reduce the likelihood of failure to shutdown the reactor following anticipated transients, and to mitigate the

consequences of an ATKS event. The requirer,ents for a boilirg water reactor i

are to install an alternate rod injection (ARI) system, a standby liquid control systen (SLCS) and to trip tte reactor coolant ree.irculation punps autoratically under conditions indicative of an ATKS.

Northeast Utilities provided informatien ty a letter dated May 5,1987, and

! supplerental inforration submitted in July 19F8 concerning their

)~ irplerentation of the ATWS Pule. Based en our review, we have concluded that the ARI design and the ATWS/ recirculation punp trip design art. in corpliance with the ATKS Pule, and are therefore acctptable. Powever, as discussed in a

! i l telecen on Septe.ber 13, 1980 with rembers of yvur staff, we request that ycu  !

, sut. nit the results of the preoperational tests to verify that the actual ARI i

function tire it within the design limit. The enclosed safety evaluation documents the staU's review and our ccnclusions on the ARI and FPT systems. '

The standby liquid control system, the third elcrent required by the ATKS l 4

rule, was evaluated in a letter dated July 30, 1987. The enclosed safety '

evaluation and the July 30, 1987 safety evaluation cortplete our review of Millstone Unit No I's coepliarce with the ATVS rule, i 1

, Sircerely, h/

Michael L. Boyle Project "anager i

ProjectDirectorate1-4 Divisicn of Reactor Projects !!!!

Office of Nuclear Peactor Fegulatian As stated cc w/ enclosure See next peSe s i

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QCT 6 61988 Docket tio.: 50-245 Mr. Edward J. Mroczka Senior Vice President Nuclear Engineering and Operations Northeast Nuclear Energy Company Post Office Box 270 Hartford, Connecticut 06141-0270

SUBJECT:

SAFETY EVALUATION ON A's45 RULE 10 CFR 50.62 (TAC #68494)

Re: Millstone Nuclear Power Station, Unit No.1 The ATWS Rule (10 CFR 50.62, "Requirements for Reduction of Risk from Anticipated Transients Without Scram (ATVS) Events for Light-Water-Cooled Nuclear Power Plant") requires improvements in the design and operati, of comercial nuclear power facilities to reduce the likelihood of failufe to shutdown the reactor following enticipated transients, and to mitigate the consequences of an ATWS event. The requirements for a boiling water reactor are to install an alternate rod injection (ARI) system, a standby liquid control system (SLCS) and to trip the reactor coolont recirculation pumps automatically under conditions indicative of an ATUS.

Northeast Utilities provided infonnation by a letter dated May 5,1987, and supplemental infomation submitted in July 1988 concerning their implementation of the ATWS Rule. Based on our review, we have concluded that the ARI design and the ATWS/ recirculation pump trip design are in compliance with the ATWS Rule, and are therefo)t acceptable. However, as discussed in a telecon on September 13, 1988 with members of your staff, wo request that you submit the results of the preoperational tests to verify that the actual ARI function time is within the design limit. The enclosed safety evaluation ,

documents the staff's review and our conclusions on the ARI and RPT systems.

The standby liquid control system, the third element required by the ATWS rule, was evaluated in a letter dated July 30, 1987. The enclosed safety evaluation and the July 30, 1987 safety evaluation complete our review of 1 Millstone Unit No. I's compliance with the ATWS rule. .

Sincerely,  !

wk) ' e---

Michael L. e Project Manager Project Directorate I-4 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation

Enclosure:

As stated cc w/ enclosure Me next page

' Fr. Edward J. Mroczka Millstone Nuclear Power Station Wortheast Nuclear Energy Company Unit No. 1 Cc:

Gerald Garfield Esquire R. M. Kacich, Manager Pay, Berry and Howard Generation Facilities Licensing Counselors at Law Northeast Utilities Service Company City Place Post Office Box 270 Hartford, Connecticut 06103-3499 Hartford, Connecticut 06141-0270 W. D. Romberg, Vice President D. D. Nordquist Nuclear Operations Fanager of Quali*y Assurance Northeast Utilities Service Company Northeast Nuclear Energy Company Post Office Box 270 Post Office Box 270 Hartford, Connecticut 06141-027C Hartford, Connecticut 06141-0270 Kevin McCarthy Director Regional Administrator Radiation Control Unit Region !

Departnent of Environnental Protection U. S. Nuclear Regulatory Commissicr4 State Office Building 475 Allendale Road Hartford, Connecticut 06106 King of Prussia, Pennsylvania 19406 Bradford S. Chase, Under Secretary First Selectmen Energy Division Town of Waterford Office of Policy and Management Hall of Records 80 Washington Street Hartford, Connecticut CC100 700 Boston Post Road Waterford, Connecticut 063PF S. E. Scace, Station Superintendent W. J. Rayrend, Resident Inspector Millstert Nuclear Power Statien Millstone Nuclear Power Statien Ncrtheast Nuclear Energy Company c/o U. S. Nuclear Regulatory Comrission Post Office Box 178 Post Office Box Bil Waterford, Connecticut 06385 Niantic, Connecticut 06357 J. P. Stetz, Unit Superintendent Millstone Unit No.1 Northeast Nuclear Energy Corrany

. Post Office Eox 128 Waterford, Connecticut 06325 e

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