ML20010E030
| ML20010E030 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 08/28/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| References | |
| TASK-06-07.F, TASK-6-7.F, TASK-RR LSO5-81-08-073, LSO5-81-8-73, NUDOCS 8109020346 | |
| Download: ML20010E030 (5) | |
Text
M August 28, 1981 g?\\
Docket No. 50-29 LS05-81-08-073 V
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--I Mr. James A. Kay 9
Senior Engineer - Licensing h
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Yankee Atomic Electric Company 9
1617 Worcester Road v
Framingham,liassachusetts 01701 m
Dear Mr. Kay:
SUBJECT:
1 SEP TOPIC VI-7.F ACCUMULATOR ISOLATION VALVES POWER AND CONTRd SYSTEM DESIGN, SAFETY EVALUATION REPORT, YANKEE R0WE The enclosed s'taff safety evaluation is based on a contractor document that has been made available to you previously. 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, Dennis it. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing
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w August 28, 1981 Docket No. 50-29 LS05 08-073 Mr. James A. Kay Senior Engineer - Licensing Yankee Atomic Electric Company 25 Research Drive Westborough, Massachusetts 01 581
Dear Mr. Kay:
RE: SEP TOPIC VI-7.F JACCUMULATOR ISOLATION VALVES POWER AND CONTROL SYSTEM DESIGN, SAFETY EVALUATION REPORT, YANKEE R0'4E The enclosed staff safety evaluation is based on a contractor document that has been made available to you previously. This evaluation is the staff's po-ition 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, i
l Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Diviskn of Licensing
Enclosures:
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Yankee Atomic Electric Company 25 Research Drive Westborcugh, Mass chusetts 01581 Greenfield Community College 1 College Drive Greenfield, Massachusetts 01301 Chairman Board of Selectmen Tcun of Rcwe Rowe, Massachusetts 01367 Energy Facilities Siting Council 14th Floor One Ashberton Place Boston,lassachusetts 02108 U. S. Ens t ronmental Protection Agency Region I Office ATTN: EI! COORDINATOR JFK Federal Building Boston, Mussachusetts 02203 Resiuent Inspector Yankee Rcwe Nuclear Pcwer Station c/o U.S. NRC Post Office Box 28 Monroe Bridge, Massachusetts 01350
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4 SYSTEMATIC EVALUATION PROGRAM TOPIC VI-7.F YANKEE R0WE TOPIC VI-7.F ACCUMULATOR ISOLATION VALVES POWER AND CONTROL SYSTEM DESIGN I.
Introduction For many loss-of-coolant accidents, the performance of the ECCS in PWR plants depends upon the procer functioning of the accumulators. The motor-operated isolation valve, provided between the accumulator and the primary system, must be considered to be an " operating bypass" (IEEE 279-1971) because, when closed, it prevents the accumulator from performing the intended protective function. Accordingly, the motor sperated isolation valve should be designed against a single failure that can result in a loss of capability to perform a. safety function.
An additional operational requirement for these valves is that they j
be closed to permit primary system deoressurization during reactor shutdown.
(See the staff's discussions of Topics V-3 and VIl-3).
II.
Review Criteria The review criteria are presented in Section 2 of EG&G Report 1398F,
" Accumulator Isolation Valves Power and Control System."
III.
Related Safety Tooics and Interfaces There are no review areas outside 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 assure that the accumulator 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 single failure in the electrical system or single operator error cannot result in the loss of capability of an accumulator to perform its safety function, and (2) Assure that the valves are operable for safe shutd.own of the plant.
V.
Evaluation As noted in EG&G Report 1398F, the Yankee Rowe accumulator isolation valve power and control system design meets the requirement of ICSB 18, Part 2.
Report 1398F also indicates that the plant does not satisfy '
i ICSB 18 Part 4 because af ter locking out power, one channel of valve
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indication is available instead of two.
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VI.
Conclusions 4
At Yankee Rowe, af ter locking out power, one channel of valve position i
indication is available instead of two. The single valve position in-dicator combined with the administrative procedures for removing power i
from the valve and the verification of valve position meets the intent i
of redundant valve position indicators and is, therefore, acceptable.
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