ML20010E424
| ML20010E424 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 08/28/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-07-03, TASK-7-3, TASK-RR LSO5-81-08-087, LSO5-81-8-87, NUDOCS 8109040116 | |
| Download: ML20010E424 (5) | |
Text
.y August 28, 1981 Docket No. 50-213 LS05 08-087 1 d3bR Mr. W. G. Counsil, Vice Pntsident 4
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Dear Mr. Counsil:
SUBJECT:
SEP TOPIC VII-3, SYSTEMS REQUIRED FOR SAFE SHUTD0%'N, DRAFT SAFETY EVALUATION FOR HADDAM NECK The enclosed draft staff safety evaluation is based on a contractor document that has been made available to you previously. This evaluation is tt'c 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 pending complettor of our review against GDC 17.
Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing l
Enclosure:
As stated cc w/ enclosure:
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Docket No. 50-213 LS05-81 08-087 Mr. W. G. Counsil, Vice President Nuclear ~ Engineering and Operations Connecticut Yankee Atomic Power Co.
Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
SUBJECT:
SEP TOPIC VII-3, SYSTEMS REQUIRED FOR SAFE SHUTDOWN, DRAFT SAFETY EVALUATION FOR HADDAM NECK The enclosed draft staff 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 pending completion of our review against GDC 17.
Sincerely, tM Dennis M. Crute fie d, Chi Operating Reactors Branch No. 5 Division of Licensing
Enclosure:
As stated cc w/ enclosure:
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1 HADDAM NECK Docket No. 50-213 Mr. W. G. Counsil cc Day, Berry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Superintendent Haddam Neck Plant RFD #1 Post Off' ~e Box 127E East Hc:,jton, Connecticut 06424 Mr. Richard R. Laudenat Manager, Generation Facilities Licensing Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Russell Library 119 Broad Street Middletown, Connecticut 06457 Board of Selectmen Town Hall Haddam, Connecticut 06103 Connecticut Energy Agency ATTN: Assistant Director Research and Policy Development Department of Planning and Energy Policy 20 Grand Street Hartford, Connecticut 06106 U. S. Environmental Protection Agency Region I Office ATTN: EIS COORDINATOR JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Haddam Neck Nuclear Power Station c/o U. S. NRC East Haddam Post Office East Haddam, Connecticut 06423
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- i, CrSTEKATIC EVALUATION PROGRAM TOPIC VII-3 I
H1DDAM NECK TOPIC VII-3 SYSTEMS REQUIRED FOR SAFE SHUTDOWN I.
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 electrical instrumentation and control sys-tems identified as being required for saie ' 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 out-side the control room were reviewed.
Included also, was a review 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:
( '. ) 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 operat-ional occurrences or pestulated accidents and (t) initiate the operation of systems and components required to bring the plant to a safe shutdown.
(2) That the required systems and equipment, including necessary in-strumentation and controls to maintain the unit in a safe condition during hot shutdown, are located at appropriate places outside the control room and have a potential capability for subsequent cold shutdown of the reactor through the suitable procedures.
(3) That only safety grade equipment is required to bring the reactor coolant system fro'm a high pressure condition to a low pressure cooling condition.
II.
Review Criteria The review criteria are presented in Section 2 of EG&G Report 0290J,
" Electrical, Instrumentation, and Control Features of Systems Require'd for Safe Shutdown."
N III.
Related Safety. Topics and Interfaces Review areas outside the scope of this topic and safety topics that are f
dependent on the present topic information for completion are identified.
in Section 3 of EG&G Report 0290J.
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+-
-2 IV.
Review Guidelines The rc/iew guidelines are presented in Section 4 of EG&G Report 0290J.
V.
Evaluation As noted in EG&G Report 0290J, the systens required to take Haddam Neck from hot shutdown to cold shutdown, assuming only offsite power is available or only onsite power is available and a single failure, are capable of initiation to bring the plant to a safe shutdown and are in compliance with current licensing criteria and the safety objectives 6f SEP Topic VII-3 except that long-term cooling (RHR) is susceptible to single EI&C failures which render long-term cooling inoperable.
The instrumentation available to control room operators to place and mentain the reactor in cold shutdown conditions meets current licensing criter since no single EI&C failures render vital parameters such as reactor pressure, temperature, etc.,1noperable.
The capability to maintain the reactor in hot shutdown from outside the control room exists and is in compliance with the safety objectives of SEP Topic VII-3.
Procedures to take the plant from hot to cold shutdown from outside the control room satisfy the safety objectives of SEP Topic VII-3.
However, as a result of the licensee's responses to the NRC generic letter dated August 8,1979, the staff is still reviewing the plant switchyard design against General Design Criterion 17. We will provide the results of
.our review in our final evaluation of this topic.
VI.
Conclusions Because charging pumps and the power operated relief valves provide an alternative method of long term cooling not considered by our contractor, the staff concludes that Haddam Neck satisfies all of the requirements for Safe Shutdown, except for GDC 17 because of the number and quality of systems provided.
Our review against GDC 17 will be conducted prior to completion of the draft Integrated Assessment for this plant.
The use of the charging pumps and relief valves for decay heat removal has not been proven for this plant.
However, the relief valve capacity will be demonstrated as a part of the TMI Task Action Plan.
If the results of these tests do not demonstrate that this method of cooling would be effective, modifications to assure long term cooling will be required.
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