ML20040F827
| ML20040F827 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 02/02/1982 |
| From: | Caruso R Office of Nuclear Reactor Regulation |
| To: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| Shared Package | |
| ML20040F828 | List: |
| References | |
| TASK-03-01, TASK-07-03, TASK-3-1, TASK-7-3, TASK-RR LSO5-82-02-018, LSO5-82-2-18, NUDOCS 8202100349 | |
| Download: ML20040F827 (4) | |
Text
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February 2,1982 l
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Docket No. 50-29 p
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Mr. James A. Kay
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.G Senior Engineer - Licensing b
Yankee Atomic Electric Company b
1671 Worcester Road Framingham, Massachusetts 01701
Dear Mr. Kay:
SUBJECT:
SEP TOPICS III-1, CLASSIFICATION OF STRUCTURES, COMPONENTS AND SYSTEMS; AND VII-3, SAFE SHUTDOWN SYSTEMS DRAFT SAFETY EVALUATION REPORT - YANKEE R0WE NUCLEAR STATION is the staff'c draft safety evaluation report (SER) on the electrical aspects of $3P r pics III-l and VII-3.
o is our contractor's technical evaluation of your plant. This technical evaluation is basis for Enclosure 1.
The staff recommends that an additional electrical source and instruments be provided so that safe shutdown operations can be conducted from the control room in the event of a failure of a valve, power supply or instru-ment bus.
The need to actually implement these changes will be determined during the integrated plant safety assessment. This topic assessment may be revised in the future if your facility design is changed or if NRC criteria relating to this topic are modified before the integrated assessment is completed.
Sincerely, 5 M s
I Ralph Caruso Project Manager D 8202100349 820202 Operating Reactors Branch No. 5 M '
PDR ADOCK 05000029 Division of Licensing
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Enclosures:
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YANKEE ROWE Docket No. 50-29 cc
-Mr. James E. Tribble, President Yankee Atomic Electric Coapany 25 Research Drive Westborcugh, Massachusetts 01581 Greenfield Community College 1 College Drive Greenfield, Massachusetts 01301 Chairman Board of Selectmen Town of Rowe Rcwe, Massachusetts 01367 Energy Facilities Siting Council 14th Floor
- One Ashburton Place
- Boston, Massachusetts 02108 U. S. Environmental Protection Agency -
Region I Office ATTN: EIS COORDINATOR JFK Federal Building Boston, Massachusetts 02203 i
Resident Inspector Yankee Rcwe Nuclear Pcwer Station c/o U.S. NRC
. Post Office Box 28 Monroe Bridge, Massaqpusetts 01350 e
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SYSTEMATIC ~ EVALUATION PROGRAM TOPICS III-l ' AND'VIIJ YANKEE R0WE TOPICS:
III-l CLASSIFICATION OF STRUCTURES, COMPONENTS AND SYSTEMS VII-3 SYSTEMS REQUIRED FOR SAFE SHUTD0AN INTRODUCTION The systems aspects of the review of Systems Required for Safe Shutdown was conducted as part of Topic V-10.B (RHR Reliability).
This safety evaluation is limited to the c:ectrical instrumentation and control sys-tems identified as being required for safe shutdown.
Plant systems that are needed to achieve and maintain a safe shutdown condition of the plant, including the capability for prompt hot : shutdown,of the reactor from outside the control room were reviewed.
Included also, was a :re-view of the design capability and method of bringing the plant from a high pressure condition to low pressure cooling assuming the use of only safety grade equipment. The objectives of the review were to assure:
(1) The design adequacy of the safe shutdown system to (a) initiate automatically the operation of appropriate systems, including the reactivity control systems, such that specified acceptable fuel design limits are not exceeded as a result of anticipated opera-tional occurrences or postulated accidents and (b) initiate the t
operation of systems and components required to bring the plant to a safe shutdown.
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(2) That the required systems and equipment, including necessary in-strumentation and controls to maintain the unit in a safe condi-tion during hot shutdown, are located at appropriate places outside the control room and have a potential capability for subsequcnt cold shutdown of the reactor through the suitable procedures.
(3) That only safety grade equipment is required to bring the reactor coolant system from a high pressure condition to a low pressure cooling condition.
In reviewing the SDCS and systems required for safe shutdown, the major electrical components and systems required for the protection of public health and safety were identified.
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REVIEW CRITERIA The review criteri: are presented in Section 2 of EG&G Report 0608J,
" Electrical, Instrumentation, and Control Features of Systems Required for Safe Shutdown'.'.
III.
RELATED SAFETY TOPICS AND INTERFACES Review areas outside the scope of this topic and safety topics that are dependent on the present topic information for cumpletion are identified in Section 3 of EG&G Report 0608J.
IV.
REVIEW GUIDELINES The review guidelines are presented in Section 4 of EG&G Report 0608J.
V.
EVALUATION Section 7 of EG&G Report 0608J lists the major electrical components and systems that are required at Yankee Rowe to protect the public health and safety.
As noted in EG&G Report 0608J, the systems required to take Yankee Rowe from hot shutdown to cold shutdown, assuming only offsite power is avail-able or only onsite power is available and a single failure, are capable of initiation to bring the plant to safe shutdown and are in compliance with current licensing criteria and the safety objectives of SEP Topic VII-3, except that long-term cooling (RHR) is susceptible single failures because redundant valves are powered from a single source and redundant instrumentation is powered from non-Class 1E sources.
VI.
CONCLUSIONS Yankee Rowe satisfies all of the requirements for Safe Shutdown except for a lack of adequate electrical supply. An additional ac onsite source is required for the Shutdown Cooling System or Low Pressure Suction Tank valves and an additional sht of instruments (from an independent Class 1E pbwer source) is required for the following parameters:
1.
Pressurizer Level (wide range),
2.
Pressurizer Pressure, 3.
Reactor Inlet Temperature, 4.
Reactor Outlet Temperature, 5.
Nuclear Power, 6.
CVCS Flow, 7.
Component Cooling Water Surge Tank Level, and 8.
Sevice Water System Flow.
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