ML19343D120
| ML19343D120 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 04/08/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-03-06, TASK-3-6, TASK-RR LSO5-81-04-008, LSO5-81-4-8, NUDOCS 8104090498 | |
| Download: ML19343D120 (4) | |
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UNITED STATES f
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p, NUCLEAR REGULATORY COMMISSION 1
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APRIL 8, 1981 b
Docket No. 50-213 LS05-81-04-008 Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company h;
Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
SUBJECT:
HADDAM NECK - SEP TOPIC III-6, " SEISMIC DESIGN CONSIDERATIONS" Our letter to you dated August 4,1980 requested in accordance with 10 CFR 50.54(f) of the Commission's regulations that you submit plans and proceed with a seismic evaluation program for the Haddam Neck facility and that you provide justification for your conclusion that-continued operation b.
'ustified in the interim until the seismic evaluation program is complete. We have reviewed your " Seismic Reevaluation Program" forwarded-by your letters dated August 5,1980 and September 15, 1980. We have determined that your program is deficient with respect to scope of structures, systems anc components to be evaluated.
Our August 4,198010 CFR 50.54(f) letter specified as a minimum, that your program should provide for an evaluation of:
1.
The integrity of the reactor coolant pressure boundary, 2.
The integrity of fluid and electrical distribution systems related to safe shutdown and engineered safety features, and 3.
The integrity and functionability of mechanical and electrical equipment and engineered safety feature systems (including con-tainment).
We have reviewed the systers at the Haddam Neck facility which are important to safety and should be included in your " Seismic Reevaluation Program."
These systems are identified in Enclosure (1).
You are requested to revise and resubmit within 30 days of receipt of this letter your " Seismic Reevaluation Program." Your revised program should
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include the systems identified in Enclosure (1) and their related structures and components. A schedule for completion of seismic reevaluations, submittal of analysis results for NRC review and the installation of any necessary 1
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modifications should be included in your revised program. _Your schedule, J
if different from our August 4,1980 request, should be justified and should be consistent with your conclusion that continued operation is justified in the interim until the seismic reevaluation program is complete and any necessary modifications are implemented.
h Sincerely, Lr A
Denn s M. Cr.-tchfield,lhief Operating '.. actors Branch No. 5 Division of Licensing
Enclosure:
As stated cc w/ enclosure:
See next page B
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ENCLOSURE (1)
SAFETY RELATED SYSTEMS, STRUCTURES AND COMP 0NENTS HADDAM NECK PLANT The scope of review for th'e seismic re-evaluation program should include the systems, structures, and components (including emergency power supply and distribution, instrumentation, and actuation systems) with the following functions:
1.
The reactor coolant pressure boundary as well as the core and vessel internals. This should also include those portions of the steam and feedwater system extending from and including the secondary side of the steam generator up to and including the outermost containment isolation valve and connected piping of 2h inch or larger nominal pipe size, up to and including the first valve that is either normally closed or is capable of automatic closure during all modes of normal reactor operation.
2.
Systems or portions of systems that are required for safe shutdown as identified in the SEP safe shutdown review (SEP Topic VII-3). The system boundary includes those portions of the system required to perform the safety function and connected piping up to and including the first valve that is either normally closed or capable of automatic closure when the safety function is required.
3.
Systems or portions of systems that are required to mitigate design basis events, i.e., accidents and transients (SEP Topics XV-1 to.XV-24).
The functions to be provided include emergency core cooling, post-accident containment heat removal, post-accident containment atmosphere cleanup, as well as support systems, such as cooling water, needed for proper function-ing of these systems.
4.
Systems and structures required for fuel storage (SEP Topic IX-1).
Integrity of the spent fuel pool structure including the racks is needed.
Failure of the liner plate due to the safe shutdown earthquake must not result in significant radiological releases, or in loss of ability.to keep the fuel covered.
Failure of cooling water systems or other systems connected to the pool should not permit draining of the fuel pool. Means to supply make-up to the pool as needed must be provided.
5.
Structures that house the above equipment.
For the Haddam Neck plant, the staff considers the following systems, and associated structures, and components should be addressed:
a) Reactor Coolant System (RCS) b) Portions of Main Steam System c) Portions of Main Feedwater System
e 2-d) Portions-of systems'directly connected to the RCS up to and including isolation. valves e) Control' Rod Drives
'f) Auxiliary feedwater System g) Residual Heat' Removal System (including ECCS recirculation mode)-
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h) Portions of Chemical and Volume Control System
') ~ Portions of Service Water System i
. j) ' High Pressure Safety Injection -System k) Low Pressure Safety Injection System
- 1) Containment Cooler System m) Spent Fuel Pool and Makeup As discussed previously, a " system" also includes the' power supply, instrument-ation and actuation systems.
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