ML17258A172

Forwards Safety Evaluation of SEP Topic VI-7.B, ESF Switchover from Injection to Recirculation Mode,Automatic ECCS Realignment. Facility Meets Current Licensing Criteria

ML17258A172
Person / Time
Site:	Ginna
Issue date:	09/18/1981
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Maier J ROCHESTER GAS & ELECTRIC CORP.
References
TASK-06-07.B, TASK-6-7.B, TASK-RR LSO5-81-09-048, LSO5-81-9-48, NUDOCS 8109220391
Download: ML17258A172 (7)

Text

Ql'eptember 18, 1981 Docket No. 50-244 LS05>>81-$ 9~K43

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Nr. John E. Naier Vice President Electric and Steam Production Rochester Gas 8 Electric Corporation 89 East Avenue Rochester, New York 14649

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SUBJECT:

SEP TOPIC VI-7.B:

ESF (ENGINEERED SAFETY FEATURES)

SWITCHOVER FRON INJECTION TO RECIRCULATION NODE, AUTOMATIC ECCS REALIGNNENT, GINNA The enclosed staff safety evaluation report is based on the information provided in your letter of August 16, 1981.

This evaluation is the staff's position regarding design of your facility in the subject area.

With regard to the referenced topic, the staff has concluded your facility meets current licensing criteria.

Sincerely, Encl osur e:

As stated Dennis N. Crutchfield, Chief Operating Reactors Branch 85 Division of Licensing CC:

See next page Si 019I2203'9Ii BiO~f~7 PDR ADOCK 05000244 i PDR OFFICE/

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Docket No. 50-244 LS05-81-09-048 UNITED STATES t

NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 September 18, 1981 Mr.'John E. Maier Vice President-El ectri c and Steam Producti on Rochester Gas-8 Electric Corporation 89 East Avenue

.Rochester, New York 14649

Dear Mr. Maier:

SUBJECT".

SEP TOPIC VI-7.B'SF (ENGINEERED SAFETY FEATURES)

SWITCHOVER.FROM INJECTION TO RECIRCULATION MODE, AUTOMATIC ECCS REALIGNMENT, GINNA The enclosed staff safety evaluation report is based on the information provided in your letteI" of August 16, 1981.

This evaluation is'the staff's

'osition regarding design of your facility in the subject area.

With regard to the referenced topic, the staff has concluded your facility meets current 1 i censing cri teri'a.

Sincerely, MHu~ ~E Dennis M. Crutchfield, Chi Operating Reactors Branch

-",'.5 Division of Licensing

Enclosure:

As stated CC:

See next page

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Nr. John E. Maier:-

CC Harry H. Yoigt, Esquire LeBoeuf,'Lamb, Leiby and HacRae 1333 Hew Hampshire

Avenue, N. M.

. Suite 1100 Mashington, D. C.

20036 Nr. Thomas B. Cochran Natural Resources Defense Council, Inc.

1725 I Street, N. M.

Suite 600 Washington, D. C.

20006 Nr. Nichael Slade 12 Trailwood Circle Rochester, New York 14618 Ezra Bialik Assistant Attorney General Environmental Protection Bureau Hew York State Department of Law 2'orld Trade Center New York, New York 10047 Jeffrey Cohen New Yor k State Energy Office Swan Street Building Core 1,

Second Floor Empire State Plaza

Albany, Hew York 12223 Director, Bureau of Nuclear Operations S.ate of Hew York Energy Office A"ency Building 2

-~w ire.State Pl aza

Albany, New York 12223 Rochester Public Library, 115 South Avenue Rochester, Hew York 14604 U. S. Environmental Protection Agency Region II Office ATTN:

Regional Radiation Representative 26 Federal Plaza Hew York, Hew York 10007 Herbert Grossman, Esq.,

Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Coomission Mashington, D. C.

20555 Dr. Richard F. Cole Atomic Safety and Licensing Board U. S. Nuclear Regulatory Conmission Washington, D. C.

20555 Dr. Eveleth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Comnission Washington, D. C.

20555 Supervisor of the Town of Ontario 107 Ridge Road Mest Ontari o, New York 14519 Resident Inspector R.

E. Ginna Plant c/o U. S.

NRC 1503 Lake Road

Ontario, New York 14519

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TOPIC VI-7.B:

ESF Ef HAGI ERED SAFETY FEATURES SWITCMO FROM IfQECTION TO RECIRCULATION YiODE, AUTOl1ATIC ECCS REALIGNMENT I.

INTRODUCTION Host Pressurized Mater Reactors (PlJRs) require operator action to re-align the ECCS for the recirculation mode following a LOCA.

The NRC staff has been requiring, on a case-by-case

basis, some automatic feat-ures to assist in the realignment of the ECCS from the injection to the recirculation mode of operation.

The safety objective of this require-ment is to increase the reliability of long-term cooling by reducing the number of operator actions required to change system realignment to the recirculation mode.

The scope of this topic requires a review of the ECCS control system and the operator action required to realign the ECCS from injection to re-circulation mode following a LOCA.

The sequence of events from initia-tion of the injection mode to completion of the recirculation mode, the systems/components and instrumentation/controls utilized in the injection..

to recirculation process, and the automatic and/or manual process requir-ed to complete the switchover process are to be reviewed.

The object-

" ive of this review is to determine if, automatic switchover is necessary to protect public health and safety.

II.

REVIEW CRITERIA The current licensing criteria which govern the safety issue are identi-:~.:

fied in Table 7-1 of the Standard Review Plan.

The most significant of these criteria are:

1.

Branch Thchnical Position 1CSB 20, 2.

IEEE Std. 279-1971, and 3,

Regulatory Guide 1.62.

III.

RELATED SAFETY TOPICS AND INTERFACES The scope of review for this topic was limited to avoid duplication of

,effort since some aspects of the review were performed under related topics.

The related topics and the subject matter are identified below.

Each'f the related topic reports contain the acceptance criteria and review guidance for its. subject matter.

III-6 Seismic Design Considerations

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III-lO.AThermal-overload protection For motor operated valves III-1 1 Component Integri ty III-12 Environmental gualificafion IV-l.A Operationwith less than all reactor coolant loops in service

.V-10.B RHR Re1iability V-ll High Pressure/Low Pressure Interface VI-7.A.3 ECCS Actuation System VI-7.C.l Independence of Onsite Power VI-10.A Testing of ESF System VI-10.B Shared Systems

Onsite Emergency Power Systems Emergency dc Systems Containment Penetrations The. following topics are dependent on the present topic information for completion.

VI-4 Containment Isolation System VI-7.C. 2 ECCS Sing 1 e Fai 1 ure Criteri on IV.

REVIEW GUIDELINES ICSB 20 states that automatic transfer to the recirculation'mode is pref-erable to manual transfer and shou:fd be provided for standard plant designs submitted for review on a generic basis under the Commission's standardi zati on pol i cy.

ICSB 20 also states that a design that provides manual initiation at the system level of the transfer to the recirculation mode, while not ideal, is sufficient and satisfies the intent of IEEE Std. 279 provided that adequate instrumentation and information display are available to the operator so that he can make the correct decision at the correct time.

Furthermore, it should be:=shown that, in case of operator error, there are sufficient time and information available so that the operator can correct the error, and the consequences of such an error are.acceptable.

V.

EVALUATION Redundant and independent Re uel ing Water Storage Tank (RWST) level il s i.l Umenta ion s used to a

e) t the op 1 a ol wnen he must initiat& a manual change over from the injection mode to the recirculation mode of emergency core cooling.

The instrumentation is oualified for the worst'nvironmental and seismic conditions.

(The RHST is located in 'the'uxiliary building).

Each instrument channel is powered from a separate Class lE bus.

These buses are evaluated in SEP Topic VI-7.C.l.

By procedure, one train is to be stopped at 31",.

RWST level if.both trains are operating.

If the operator should ignore this alarm (and his indicator from the other

. channel) he has 71,925 gallons or approximately 65 minutes until he reaches the 105 RWST level.

Changeover normally occurs at 10/, but 34,250 gallons or 31 minutes additional injection on both trains is possible.

Redundant valves are used to close minimum flow lines (that may contain highly radioactive water) that return flow to the refueling water storage tank.

However, two of these valves are in series and share the same motive power (air) and fail closed on loss of air.

The staff's review of valve failures does not indicate a history of failures in air operated valves at the Ginna plant.

VI.

CONCLUSION, As a result of our review, the staff concludes that:

l.

ICSB 20 has been satisfied; 2.

A recirculation path to the refueling water storage tank relies upon two air operated valves that share an air supply.

Although

. these valves are not entirely independent, plant operating experience

'as demonstrated the acceptability of this design; and 3.

Beyond the failures identified.in Topic VI-7.C.l, there are no single failures within either ECCS train that could result in a simul-taneous loss of both ECCS train nor in a significant release of fision products as a result of the changeover from the, injection to the recirculation mode of 'ECCS at Ginna.