ML18046B014
| ML18046B014 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/27/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| TASK-06-07.F, TASK-6-7.F, TASK-RR LSO5-81, NUDOCS 8111020239 | |
| Download: ML18046B014 (4) | |
Text
Docket No. 50-255 LSoS Mr. David P. Hoffman Nuclear L 1cens1ng *Administrator Consumers Power Company 1945 W. Parnall Road Jackson, Michigan 49201
Dear Mr. Hoffman:
SUBJECT:
SEP TOPIC VI-7.F, ACCUMULATOR ISOLATION VALVES POWER AND CONTROL SYSTEM DESIGN, SAFETY EVALUATION FOR PALISADES The enclosed staff safety evaluation has been revised to reflect. the staff's current pos1tton wt th regard to a change tn the Techntcal Spec1ftcat1ons for Pal tsades.
As a result of our new: ~osit1on, the s~ff considers Toptc VI-7.F to I be.completely satisfactorily::l
Enclosure:
As stated cc w/enclosure:
See next pag.e Sincerely.
Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Df vf sf on of Lfcensf ng
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Mr. David P. Hoffman cc M. I. Miller, Esquire Isham, Lincoln & Beale Suite 4200 One First National Plaza Chic_ago, Illinois 60670 I
Mr. Paul A. Perry, Secretary Consumers Po\\:ier Coll\\)any 212 West Michigan ~nue Jackson, Michigan 49491 Judd L. Bacon, Esquire Consumers Power Corrt>any 212 West Michigan Avenue Jackson, Michigan 49201 Myron M. Cherry, Esquire Suite 4501 One I BM Plaza Chicago, Illinois 60611 Ms. Mary P. Sinclair
- Great Lakes Energy Alliance
. 5711 Summerset Ori ve Midland, Michigan 48640 Kalamazoo Public Library 315 South Rose Street Ka 1 am,azoo, Mi chi ga n 49006 Township Supervisor Covert To\\*tnship Route l, Box 10 Van Buren County, Michigan 49043 Office of the Governor (2)
Room 1 - Capitol Building
- u. s. Environmental Protection Agency Fe*deral Activities Branch Region V Office ATTN:
EIS COORDINATOR 230 South Dearborn Street Chicago, Illinois 60604 Charles Bechhoefer, Esq., Chairman Atomic Safety and Licensing Board Panel
- u. s. Nuclear Regulatory Conmission.
- Washington, D. c.
20555.
Dr. George C. Anderson Department of Oceanography University of Washington Seattle, Washington 98195 Dr. M. Stanley Livingston 1005 Calle Largo Santa Fe, New Mexico 87501 Resident Inspector c/o U. S. NRC P. o. Box 87 South Haven, Michigan 49090 Lansing, Michiga*n 48913 William J. Scanlon, Esquire 2034 Pauline Boulevard Ann Arbor, Michigan 48103 Palisades Plant ATTN:
Mr. Robert Montross Plant Manager Covert; Michigan 49043
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SYSTEMATIC EVALUATION PROGRAM TOPIC Vl-7.f:*.
PAL I SADES *
.* :i-**-
TOPIC:
Vl-7. F.
ACCUMULATOR ISOLATION VALVES PO\\*!ER AND CONTROL SYSTEM I.
I I.
III.
DESIGN
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Introduction tJI'
.~:*' ~
For m~ny loss-of-coolant accidents, t1ie performance of the ECCS in PWR plants depends upon the proper functioning of the accumulators.
The motor-
. operated i sol ati on valve, provMed between the accumulator and the primary system~* must be considered to be an* "operating bypass" (IEEE 279-1971}
because, \\~hen closed, it prevents th~ accumulator from performing the intended protective function.. Accordingly, the motor-operated isolation
- valve snould be designed against a single failure that can result in a loss of capability to perform a safety function.
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An additional operational requirement for these valves is that *they be.
closed to permit primary system depressurization during reactor sh~tdown.
(See the staff's discussions of Topics V-3 and VII-3).
Review Criteria The review criteria are presented in Section 2 of EG&G Report 1302F.
Related Safety Topics and Interfaces There are no review areas oatside the scope of this topic and there are no other safety topics that are dependent on the present topic informa~
tion for completion.
IV.
Review Guidelines The objective of this SEP Topic is to ~ssure that the ~cc~mulator isola-tion valves:* (1) Meet the "operating bypass" requirements of IEEE 279-1971 which states that *the bypass of a protective function will be removed automatically whenever permissive conditions are not met to assure that a s*ingle failure in the e.lectrical system or single operator error cannot result in the loss of cap~bility of an accumulator to perfoTin its safety function, and (2) Assure that the valves are opetable\\for safe shutdown.
of the plant.
V.
Evaluation
- As noted in EG&G Report 1302F, The Palisades accumulator isolation valve power and control system design meets the requirement of ICSB 18, Part 2, with the exception that plant Technical Specifications do not list.
the isolation valves by number.
Report 13 02 F also indicates that the plant design cannot accommodate the loss of a single accumulator during a large LOCA and, as a consequence, the Technical Specifications allow only one SI Tank to be out of service for no more than one hour during power operation.
This situation is a direct consequence of the accident analyses assumption that all of the contents of one SI tank is lost out of the break without folowing through the core.
The report also notes that the valve breakers are located inside of containment, only a single valve position system is provided, and that the motor control center (MCC9) is not qualified for an accident environment.
Additional review by I&E has shown that MCC9 is not powered from an onsite source.
VI.
Conclusions The staff recommends that the Technical Specifications be modified to include designation of the subject valves by number in some future change to the Technical Specifications.
This change is not considered to be of such significance as to require a Technical Specification change in and of itself.
The Palisades accumulator isolation valve power and control system design does not meet current licensing criteria, in that control room valve position indication is neither redundant nor single-failure free.
However, the Palisades design is acceptable to the staff, because the single valve position indicator combined with the administrative procedures for removing power from the valve and the verification of valve position meets the intent of redundant valve position indicators.
. The use of a non-Class lE valve motor power circuits is acceptable because procedures for remote venting of the accumulators from out-side of the containment during plant cooldown are available.