ML20128A578
| ML20128A578 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 01/19/1993 |
| From: | Ebneter S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Tuckman M DUKE POWER CO. |
| References | |
| NUDOCS 9302020252 | |
| Download: ML20128A578 (5) | |
Text
.
c "JAN 191993 Docket Nos. 413 and 50-414 License Nos.
NPF-35 and :4Pf-52 Duke Power Company AiTN: Mr. M. S. Tuckman Vice President Catawba Site P. O. Box 1439 York, SC 29745-9635
SUBJECT:
TEMPORARY WAIVER OF COMPLIANCE FOR CATAWBA UNITS J AND. 2 DOCKET NOS 50-413 AND 50-414 This letter acknowledges your letter dated January 15, 1993, requesting a Temporary Waiver of Compliance (TWOC) from Technical Specification _(TS) 3.7.6(a), Control Room Area Ventilation System. The TS requires two independent Control Room Area Ventilation Systems to be _0PERABLE at all times.
The Control Roo'n Area Ventilation and Air Conditioning untems (VC/YC) are designed to maintain the environment in the control rocm,: control room area and switchgear rooms within 'accepta.ble lim _its for the operation of unit
- controls, for required maintenance and testing of the-controls, and for uninterrupted safe occupancy of the control room during post-accident shutdown.
T'.c control room-and other support areas are designed to be maintait.W at approximately 74 degrees F and-50 percent relative humidity. -
The maximum control room temperature permitted by TS 4.5.6(a} is 90 degrees F.
- ontinuous presviruation of the control room area is' required to prevent entry of dust, smoke, and radioactive particulate and gaseous matter originating outside the pressurized zones.
'The Control Room Area Ventilation Systems are provided with two 100 percent L
capacM/ 1.ains which am shared between Units 1 and 2.-
If one train fails.,--
1, l
indice-)n is provided-in the control room and the operators can manually-switchover to the redundant train.
~
The TS 3.7.6(a) ACTION statement for MODES 1 through 4 requires that with one l
l:
VC/YC System inoperable' for reasons Lother than the filter train heaters, the inoperable system must be restored to-0PERABLE status within-7 days or be in at least HOT STANDBY within the next 6-hours and in COLD SHUTOOWN within:the-following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
On January :,1993, _during a swapover from Train-A to Train B of the VC/YC -
Systems, the Train B chiller would not start. Troubleshooting efforts identifled a ground fault in the. Train B chiller compressor ~ motor. This compressor motor housing functions as.the chiller pressure boundary and the L
motor is located internal to the housing. Major disassembly was required to _
l accomplish t% repair effort. 'Given the magnitude = of the repair process. and l
the post-maintenance-testing. required prior to returning.the chiller to-
<ervice, the aossibility existed that the repairs d testing would. not' be '
,4 completed wit 1in the 7 days allowed by TS 3.7.6(a).
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PUR; f
UAN 191993 '
Duke 1-ower Company 2
.You requested a temporary waiver from TS 3.7.6(a) to permit Unite 1 and 2 to remain at 100 percent power until the Train B chiller could be repaired, tested and returned to service.
Specifically, you requested a 3 day extension a
to the 7 days allowed by TS 3.7.6(a). This extension would axtend through-January 21,1993, until 1:30 a.m., and would allow sufficient time to repair-the Train B VC/YC Chiller and complete the necessary post-maintenance testing.-
Region 11 granted this TWOC from the TS requirements and permitted Units 1 and 2 to continue to operate at full power until the Train B VC/YC Chiller was repaired and restored to operable status.
Prior to granting the TWOC, the technical issues and the extent of the proposed vaiver were reviewed.
They were discussed during a telephone conference on January 14, 1993, between A. R. Herdt, G. A. Belisle, G. A.
Harris and J. Zeiler of Region 11; D. B. Matthews, L. A. Wiens, R. E. Martin and W. T. Lefave, Office of Nuclear Reactor Regulation (NRR); and W. R.
McCollum, T. P. Harrall and others of your staff.
Specifically, as' described t
in your request, the items discussed included the requirements for which the waiver was requested, the circumstances and need for prompt-action, compensatory actions implemented, evaluation of the safety significance and potential consequences, justification for the duration of the request, and the basis for your conclusion that a significant hazard was not involved.
It was our understanding that the existing chiller motor:would be replaced with a new motor and sufficient' testing performed following installation to verify operability of the B Train VC/YC System. The A Train VC/YC System o
L would be maintained fully operable.
The failure of the A Train would result '
in both Catawba units entering TS 3.0.3 which requires both units =to'be-shutdown and brought to COLD SHUTOOWN. To mitigate thet effects of the' loss of both trains of VC/YC, the following measures, as determined by the Shift Supervisor, would be implemented: = opening control room instrument cabinet l
doors to provide increased air flow;. utilizing temporary fans to cool interior' L
of cabinets; maintaining control room door-s in the open position with j
temporary fans in place to utilize computer area ventilation / chilled' water i
system for control room cooling; deenergizing filter heaters in the VC/YC filter trains; and utilizing portable coolers Sr control room cooling.
As agreed upon, in addition to maintaining the A Train VC/YC System operable and initiating preparations-to ht.ve the-specified temporary equipment readily.
available, your compensatory actions included the following: Diesel Generators H
1A and 2A would not be removed from service-for preplanned maintenance; monitoring of A Train.VC/YC by operations staff would be increased; and deta'iled discussions would be given to all on-coming new shift personnel to explain the circumstances-regarding VC/YC operation and the compensatory L
measures required if A Train became inoperable.
I-The NRC granted this TWOC for three days (72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />) on January 15, 1993. The-NRC _was subsequently informed that the-B Train VC/YC Chiller had been repaired
- and the Control Room Area Vestilation System restored to the requirements of--
TS 3.7.6 prior to the expiration of the original time specified in TS ACTION L
Duke Power Company 3
STATEMENT, i.e., 7 days. Unit I and Unit 2 are now in full comliance with the TS.
Since full compliance was attained within the time limitations.
imposed by the original TS, the provisions of the TWCC did not have to be implemented.
Sincerely, y,
. pr;m.erf uh
"'LLY Mbo Stewart D. Ebneter Regional Administrator cc:
R. C. Futrell Compliance Duke Power Company 4800 Concord Road York, SC 29745-9635 A. V. Carr, Esq.
Duke Power Company 422 South Church Street Charlotte, NC 28242-0001 J. Michael McGarry,11!, Esq.
Winston and Strawn 1400 L Street, NW Washington, D. C.
20005 North Carolina MPA-1 Suite 600 P. O. Box 29513 Raleigh, NC 27626-0513 lleyward G. Shealy, Chief Bureau of Radiological liealth S. C. Department of Health and Environmental Control 2600 Bull Street Columbia, SC 29201 Richard P. Wilson, Esq.
Assistant Attorney General S. C. Attorney General's Of fice P. O. Box 11549 Columbia, SC 29211 cc:
Continued see page-3
_~
s. L.
9 993:-
Duke Power Company-4 cc:
Continued'-
s Michael =Hirsch Federal-Emergency Management Agency 500 C: Street, Sw, Room 840-Washington, D. C.
20472 i
North Carolina Electric Nembership Corporation P. O. Box 27306 Raleigh, NC 27611 Karen E. Long Assistant Attorney General N. C. Department of Justice P. O. Box 629 Raleigh, NC 27602 s
Saluda River Electric
-Cooperative, Inc.
P. O. Box 929 Laurens, SC 29360 T. Richard Puryear
-Nuclear Technical ~ Services Manager Carolinas District Westinghouse Electric Corporation P. O. Box 32817-Charlotte, NC-28232 -
County Manager;of York County-York County Courthouse York, SC 29745-
~e Piedmont Municipal Power Agency 121 Village Drive-Greer, SC-29651 G. A. Copp Licensing - EC050 Duke Power Company P. O. Box 1007 Charlotte, NC 28201-1007 g
e d
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'JAN 191993 Duke Power Company 5
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T. E. Murley, NRR S. A. Varga, NRR J. Lieberman, NRR M. L. Boyle, NRR J. G. Partlow, NRR R. E. Martin. NRR W. H. Miller, Ril G. A. Harris, Ril G. A. Belisle, Ri!
A-R. Herdt, Ril Document Control Desk NRC Resident Inspector U.S. Nuclear Regulatory Conunission Route 1, Box 179-N York, SC 29745) (f .I denklHils WMk'g. Y'GBdlisle AHerdt JJ)\\T93 h son Glainas ller l'y 1/g/93 1//y/93 1/j}/93 1/j'/03 1/g/93 l a s' + l __ __}}