ML20238B136
| ML20238B136 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 09/02/1987 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO. |
| Shared Package | |
| ML20238B139 | List: |
| References | |
| NUDOCS 8709090541 | |
| Download: ML20238B136 (5) | |
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NUCLEAR REGULATORY COMMISSION
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Docket *M :
50-213 September 2,1987 Mr. Edward J. Mroczka, Senior Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company Post Office Box 270 Hartford, Connecticut 06141-0270
Dear Mr. Mroczka:
SUBJECT:
EXTENSION OF THE TEMPORARY EXEMPTION FROM THE SINGLE FAILURE tRITERION (GENERAL DESIGN CRITERION N0. 35)
Re:
Haddam Neck Plant On March 25, 1986, Connecticut Yankee Atomic Power Company (CYAPCO) reported that the results of analyses of a small limited range of break sizes in one loop of the reactor coolant system (RCS) showed that sa'aty injection flow durirg only the high pressure recirculation mode may be insufficient to pro-I vide adequate long-term core cooling. By letter dated April 10, 1986, CYAPC0 i
proposed a temporary high pressure safety injection (HPSI) recirculation mode to provide adequate cooling flow to the core for the above range of pipe l
breaks until CYAPC0 could identify and establish a permanent solution. Because j
t!.e proposed temporary solution did not satisfy the single failure criterion for i
ts valves located outside containment CYAPC0 requested a temporary exemption frpmGeneralDesignCriterionNo.35(GDC35)forthesubjectvalves.
By!1etter dated April 28, Ic26, the Commission granted the temporary exemption i
frds the requirements of GDC 35 for the subject valves for the period of Cycle 14 op9 ration.
Further, the Commission specified that CYALO was to provide a des-cri;ption of the long-term resolution of this issue and a schedule for completion ofsplant modifications by the end of September 1986. The Comission also stated that the exemption could be extended provided that good cause exists for an f
extension.
I By letters dated September 30, 1986 and April 1, 1987, CYAPC0 provided a des-cription of the proposed resolution of the problem and a schedule for completion of all plant modifications.
Because some of the required plant modifications could not be implemented until the end of the Cycle 15 outage, CYAPC0 also re-l quested a one cycle extension to the exemption granted on April 28, 1986.
j CYAPC0's proposed resolution provides for high pressure coolant injection and 3
recirculation by aligning the Residual Heat Removal (RHR) pump discharge to the 1
HPSI pump suction piping.
This permits high pressure injection into tb RCS I
from the containment sump. The cross-tie connection between the RHR pump dis-charge and the HPSI pump suction will be accomplished by the addition of two eight inch lines, each with a separate motor-operated valve. Modifications to 8709090541 070902 PDR ADOCK 05000D13 i
P pon l
I Mr. E. J. Mroczka September 2,1987 the HPSI suction piping will'be located in the Primary Auxiliary Building (PAB).
pipe trench and high pressure safety injection / low pressure safety injection HPSI/LPSI pump pit.
Modifications to the HPSI mini-flow line will be in the HPSI/LPSI pump pit.
Modifications to the four injection lines for flow bal-ancing will be in containment.
The tie-in to the RHR system will require that the.RHR system be drained and disabled and will require a full core offload This offload is already planned for the Cycle 14 outage to support the 10 year core barrel inspection.
Consequently, CYAPC0 should be able to complete all piping and valve modifications during the Cycle 14 outage Following completion of all piping and valve modifications, manual operation of tha RHR/HPSI. injection alignment can be accomplished should the need arise.
CYAPCO has stated that new procedures and appropriate training will be imple-mented to assure that the new valves outside containment can be manually operated when required.
CYAPC0 has determined that there will be adequate manpower, access and time to implement these operations.
Further, CYAPC0 in-tends to conduct periodic surveillance of the valves pending completion of the electrical modifications during Cycle 15 outage.
The need for the extension arises because there are no safety-related motor control center (MCC) compart-ments available at the Haddam Neck Plant to power the new motor-operated valves.
However, a limited number of MCC compartments will become available upon the completion of the new switchgear room by the end of the Cycle 15 outage.
The staff has reviewed your proposed modifications and your extension request and concludes that you have shown good faith in that CYAPC0 will implement all necessary mechanical modifications during the current Cycle 14 outage. These modifications include installation and testing of the new valves, piping and supports previously described.
The staff has reviewed the proposed modifi-cations and concluded that the installed piping modifications will not affect
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the ability of the existing core cooling systems to provide adequate core cool-
'I ing during the additional cycle of operation.
Because the piping modifications are passive (not powered), the Haddam Neck Plant will operate over the next cycle using the ECCS configuration evaluated at the time the initial exemption was granted.
Further, revisions to the emergency operating procedures including operator training in the manual use of the HPSI/RHR configuration (ender extreme
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circumstances) will be completed prior to Cycle 15 operation.
A Safety Evalu-l ation on the final ECCS design modifiestions is enclosed.
The staff has also concluded that the only item preventing completion of this activity during the current outage is the ability to provide a safety-related power supply to the new motor-operated valves from existing power sources.
Based upon information presented to the staff, the staff concludes that com-pletion of the new switchgear room will provide additional motor control center j
compartments and, therefore, a safety-related power source to the new valves.
l l
l Based upon the information presented above and in your letters dated September 30, 1986 and April 1, 1987, the staff finds that your extension request was filed on a l
timely basis and demonstrates good cause for an extension of time to install the 1
I 1
1 Mr. E. J. Mroczka September 2,1987 permanent plant modifications to resolve the small break LOCA issue. Therefore an extension to the temporary exemption from the requirements of General Design Criterion No. 35 of Appendix A to 10 CFR Part 50 and the Interim Acceptance Criteria for valves RH-MOV-874 and SI-MOV-24 is hereby granted until startup from the Cycle 15 outage. This is consistent with the planned completion date of the new switchgear room at the Haddam Neck Plant'and the CYAPC0 request for a one cycle extension.
Sincerely, Gae.g eco rg DusatL awacseM Dennis M. Crutchfield, Director Division of Reactor Projects - III, IV, V and Special Projects I
Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc: See next page DISTRIBUTION
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ISAPD File NRC & Local PDRs T. Murley/J. Sniezek F. Miraglia C. Rossi D. Crutchfield/F. Schroeder M. Shuttleworth F. Akstulewicz OGC-Bethesda E. Jordan J. Partlow T. Barnhart (4)
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- Mr. E. J. Mroczka September 2,1987 permanent plant modifications to resc1ve the small break LOCA issue.
Therefore an extension to the' temporary exemption from the. requirements.of General Design' Criterion No. 35 of Appendix A to 10 CFR Part 50 and the Interim Acceptance Criteria for valves RH-M0V-874.and SI-MOV-24 is hereby granted until. startup.
from the Cycle 15. outage..This is consistent with the planned completion date "of the new switchgecr room at the Haddam Neck Plant and the.CYAPC0 request for a one cycle extension.
Sincerely, Dennis M. Crutchfield, Director Division of Reactor Projects - III,
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IV, V and Special Projects Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc:
See next page DISTRIBUTION Docket File ISAPD File NRC & Local PDRs T. Mu: ley /J. Sniezek
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.Mr. Edward J. Mroczka
' Connecticut Yankee Atomic Power Company Haddam Neck Plant
- CC*
Kevin McCarthy,. Director Gerald. Garfield, Esquire-J
-Day, Berry & Howard-Rediation Control Unit l
Counselors at Law.
Department of Environmental-Protection; l:
- City Place.
06103-3499 State Office Building Hartford,. Connecticut Hartford, Connecticut 06106 Superintendent-Haddam Neck Plant Richard M. Kacich, Manager-RDF #1 Generation Facilities Licensing.
Northeast Utilities Service Company
. Post Office Box 127E 06424' Post Office Box 270 East Hampton, Connecticut Hartford, Connecticut 06141-0270 Wayne D. Romberg Vice President, Nuclear Operations Northeast Utilities Service Company Post Office Box:270 Hartford, Connecticut- 06141-0270 bon ' of Selectmen Tc a Hall j
Haddam, Connecticut 06103 State of Connecticut i
Office of Policy and Management
-ATTN: Under Secretary Energy l
Division-80 Washington Street Hartford, Connecticut 06106 Resident Inspector Haddam Neck Nuclear Power Station c/o U.S. NRC P. O. Box.116 East.Haddam Post Office
. East Haddam, Connecticut 06423 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue L-King of Prussia, Pennsylvania 19406 y
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- r Mr. Edward J.?Mroczka R' L Connecticut Yankee Atomic Power. Company Haddam Neck Plant -
cc:-
W Gerald Garfield, Esquire Kevin McCarthy, Director Day, Berry & Howard Radiation Control Unit
. Counselors at Law Department of Environmental.
City Place:
Protection
, Hartford. Connecticut 06103-3499 State Office Building Hartford, Connecticut 06106
' Superintendent Haddam Neck Plant-Richard M. Kacich, Manager RDF #1 Generation Facilities Licensing Post Office Box 127E Northeast Utilities Service Company
' East Hampton, Connecticut 06424 Post Office Box 270 Hartford, Connecticut 06141-0270 Wayne D. Romberg Vice President', Nuclear Operations Northeast' Utilities. Service' Company-Pcst. Office Box 270 Hartford, Connecticut 06141-0270 Board of Selectmen Town Hall Haddam, Connecticut. 06103
' State of Connecticut Office of Policy and Management ATTN: Under Secretary Energy Division.
80 Washington Street-
. Hartford, Connecticut 06106 Resident inspector.
Haddam Neck Nuclear Power Station c/o-U.S. NRC P.:0. Box 116
~ East Haddam Post' Office East Haddam, Connecticut 06423 Regional A.: 'nistrator, Region I U.S. Nucleu Regulatory Commission 631 Park Avenue
. King of Prussia, Pennsylvania' 19406 1
.