ML16266A155
| ML16266A155 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/01/1992 |
| From: | Reyes L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Hampton J DUKE POWER CO. |
| References | |
| NUDOCS 9210140233 | |
| Download: ML16266A155 (4) | |
Text
Docket Nos.
50-269 and 50-270 OCT I 199 License Nos. DPR-38 AND DPR-47 Duke Power Company ATTN:
Mr. J. W. Hampton Vice President Oconee Site P. 0. Box 1439 Seneca, SC 29679
SUBJECT:
TEMPORARY WAIVER OF COMPLIANCE FOR OCONEE UNITS 1 AND 2 DOCKET NOS. 50-269 AND 270 This letter acknowledges your letter dated October 1, 1992, requesting a Temporary Waiver of Compliance (TWOC) from Technical Specification (TS) 3.3.2.a, Low Pressure Injection (LPI) System. The TS requires two independent LPI trains to be operable. Each train is comprised of an LPI pump and a flowpath capable of taking suction from the borated water storage tank and discharging into the Reactor Coolant System (RCS) automatically upon Engineered Safeguards Protective System (ESPS) actuation (LPI segment),
together with LPI coolers and two reactor building emergency sump isolation valves. Tests or maintenance are allowed on any component of the LPI system provided the redundant train of the LPI system is operable and both trains are returned to service within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
If the LPI system cannot be restored to service within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, TS 3.3.2.a.(2) requires the reactor to be placed in a hot shutdown condition within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
If two trains are not provided within the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following hot shutdown, the reactor shall be placed in a condition with RCS pressure below 350 psig and RCS temperature below 250 degrees F within an additional 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
You are requesting a temporary waiver to permit Units 1 and 2 to remain at less than 10 percent power for 84 hours9.722222e-4 days <br />0.0233 hours <br />1.388889e-4 weeks <br />3.1962e-5 months <br /> to permit necessary modifications and testing of the LPI system to restore these systems to an operable status.
On September 30, 1992, your staff identified, during a review of Low Pressure Service Water (LPSW) pump test data, that the LPSW pumps could provide greater flow than had previously been assumed. This could result in the failure of both LPI system trains for both units under the following concurrent conditions; a LOCA, loss of instrument air, the single failure associated with one of the LPSW valves supplying the LPI coolers failing to open, and assuming no operator action to respond to the high flow conditions. Under these conditions, no LPI coolers would be available. One cooler would have no flow due to the closed valve and the other cooler would be degraded due to the high flow conditions. Units 1 and 2 have shared LPI and LPSW systems. This problem is not applicable to Unit 3.
9210140233 921001 PDR ADOCK 05000269 P
OCT - 1 1992 Duke Power Company 2
Units 1 and 2 commenced controlled power reductions on September 30, 1992, as required by the TS due to both trains of the Low Pressure Injection (LPI) systems being inoperable. The power reductions were initiated at approximately 2:19 p.m. for Unit 1 and 4:00 p.m. for Unit 2.
Region II granted a TWOC from the TS requirements. This permitted Units 1 and 2 to operate at less than 10 percent power for an additional 84 hours9.722222e-4 days <br />0.0233 hours <br />1.388889e-4 weeks <br />3.1962e-5 months <br /> from 3:10 p.m. on September 30, 1992, to restore the LPI system to operable status.
Prior to granting the TWOC, the technical issues and the extent of the proposed waiver were reviewed. They were discussed during telephone conferences on September 30, 1992, between L. Reyes, E. Merschoff, A. Herdt and others of Region II; G. Lainas, D. Matthews, L. Wiens, S. Jones and A. Dummer, Office of Nuclear Reactor Regulation (NRR); and J. Hampton, H. B. Barron, J. M. Davis, B. L. Peele, R. L. Sweigart and others of your staff. Specifically, as described 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 is our understanding that a flow limiting device will be installed on the LPSW flow controller from each LPI cooler to reduce the flow through the coolers to meet the cooler's design specifications. Sufficient testing will be performed following installation to verify operability of each system.
As agreed upon, your compensatory actions will include: a reduction in power for Units 1 and 2 and maintaining the power levels at less than 10 percent and maintaining the Engineered Safety functions operable throughout this period.
Furthermore, following completion of the testing and setting of the flow limiting devices, Duke Power Company/Oconee Management will discuss the results of the LPSW system tests with NRC Region II prior to escalating reactor power above 10 percent.
The NRC granted this TWOC for 84 hours9.722222e-4 days <br />0.0233 hours <br />1.388889e-4 weeks <br />3.1962e-5 months <br /> from 3:10 p.m.(EDT) on September 30, 1992 for Units 1 and 2 subject to the actions listed above.
Sincerely, Luis A. Reyes puty Regional Administrator cc:
(See page 2)
OCT
- I 1992 Duke Power Company 3
cc:
M. E. Patrick Karen E. Long Compliance Assistant Attorney General Duke Power Company N. C. Department of Justice P. 0. Box 1439 P. 0. Box 629 Seneca, SC 29679 Raleigh, NC 27602 A. V. Carr, Esq.
Duke Power Company 422 South Church Street Charlotte, NC 28242-0001 County Supervisor of Oconee County Walhalla, SC 29621 Robert B. Borsum Babcock and Wilcox Company Nuclear Power Generation Division 1700 Rockville Pike, Suite 525' Rockville, MD 20852 J. Michael McGarry, III, Esq.
Winston and Strawn 1400 L Street, NW Washington, D. C. 20005 Office of Intergovernmental Relations 116 West Jones Street Raleigh, NC 27603 Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, SC 29201 Manager, LIS NUS Corporation 2650 McCormick Drive Clearwater, FL 34619-1035 R. L. Gill Nuclear Generation Department Mail Stop EC050 Duke Power Company P. 0. Box 1006 Charlotte, NC 28201-1006
OCT - I 1
Duke Power Company 4
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L. Wiens, NRR W. Miller, RH G. A. Belisle, RH A. R. Herdt, RH Document Control Desk NRC Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, SC 29678 RI I :DR 0/
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