ML17279A303
| ML17279A303 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 05/29/1987 |
| From: | Knighton G Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17279A304 | List: |
| References | |
| TAC-64358, NUDOCS 8706090445 | |
| Download: ML17279A303 (9) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 WASHINGTON PUBLIC-POWER SUPPLY SYSTEM DOCKET NO. 50-397 WPPSS NUCLEAR PROJECT NO.
2 AMENDMENT TO FACILITY OPERATING LICENSE Amendment No.
43 License No.
NPF-21 1.
The Nuclear Regulatory Commission (the Commission or the NRC) has found that:
A.
The application for amendment filed by the Washington Public Power Supply System (the Supply System, also the licen'see),
dated January 6,
1987 as clarified by letters dated parch 3, 1987 and Parch 12, 1987 complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's regulations set forth in 10 CFR Chapter I; B.
The facility will operate in conformity with the application, the provisions of the Act, and the. regulations of the CoIIWIission; C.
There is reasonable assurance:
(i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations set forth in 10 CFR Chapter I; D.
The issuance of this amendment will not be i'nimical to the common defense and security or to the health and safety of the public; and E.
The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have been satisfied.
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2.
Accordingly, the license is amended by changes to the Technical Specifications as indicated in the enclosure to this license amendment and paragraph 2.C.(2) of the Facility Operating License No. NPF-21 is hereby amended to read as follows:
(2)
Technical S ecifications and Environmental Protection Plan The Technical Specifications contained in Appendix A, as revised through Amendment No. 43, and the Environmental Protection Plan contained in Appendix B, are hereby incorporated in the license.
The licensee shall operate the facility in accordance with the Technical Specifications and the Environmental Protection Plan.
3.
This amendment is effective as of the date of issuance.
FOR THE NUCLEAR REGULATORY COMMISSION
Enclosure:
Changes to the Technical Specifications George W. Knighton, Director Project Directorate V
Division of Reactor Projects - III/IV/V 5 Special Projects Date of Issuance:
Nay 29.
1987
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May 29, 1987 ENCLOSURE TO LICENSE AMENDMENT NO.
43 FACILITY OPERATING LICENSE NO.
NPF-21 DOCKET NO. 50-397 Replace the following pages of the Appendix "A" Technical Specifications with the enclosed pages.
The revised pages are identified by Amendment number and contains vertical lines indicating the areas of change.
REMOVE 8 3/4 1-4 3/4 1-21 3/4 1-22 INSERT B 3/4 1-4 3/4 1-21
'/4 1-22
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REACTIVITY CONTROL SYSTEMS BASES CONTROL RODS PROGRAM CONTROLS (Continued)
The RBN is designed to automatically prevent fuel damage in the-event of erroneous rod withdrawal from locations of high power density during high power operation.
Two channels are provided.
Tripping one of the channels will block erroneous rod withdrawal soon enough to prevent fuel damage.
This system backs up the written sequence used by the operator for withdrawal of control rods.
3/4. 1.5 STANDBY LI UID CONTROL SYSTEM The standby liquid control system provides a backup capability for bringing the reactor from full power to a cold, Xenon-free
- shutdown, assuming that none of the withdrawn control rods can be inserted.
To meet this objective, it is necessary to inject a quantity of boron which produces a concentration of 660 ppm in the reactor core.
To account for imperfect mixing and leakage, an addi-tional margin of 165 ppm boron equivalent is added.
For RHR shutdown dilution, an additional quantity of boron equivalent to 275 ppm is added to ensure the final concentration will not be less than 660 ppm in the reactor core.
To achieve this shutdown requirement, a minimum solution of 4587 gallons containing a minimum of 5500 pounds of sodium pentaborate decahydrate is required.
This quantity of sodium pentaborate decahydrate will provide an undiluted concentra-tion of 1100 ppm of boron in the reactor core.
A minimum 41.2 gpm per pump injection rate has been selected to override the reactivity insertion rate due to cool down and zenon decay.
The minimum storage volume of the solution is established to allow for the por-tion below the pump suction that cannot be inserted and the filling of other piping systems connected to the reactor vessel.
The temperature requirement on the sodium pentaborate solution is necessary.to ensure that the sodium penta-borate remains in solution.
With two pumps and explosive injection valves and with a highly reliable control rod scram system, operation of the reactor is permitted to continue for short periods of time with the system inoperable or for longer periods of time with one of the redundant components inoperable.
Surveillance requirements are established on a frequency that assures a
high reliability of the system.
Once the solution is established, boron concentration will not vary unless more boron or water is added, thus a check on the temperature and volume once each 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> assures that the solution is available for use.
Replacement of the explosive charges in the valves at regular intervals will ensure that these valves will not fail because of deterioration of the charges.
For Anticipated Transient Mithout Scram (ATMS), mitigation requires an equivalent 86 gpm -- 13K sodium pentaborate decahydrate pumping rate.
This requirement is met by running both standby liquid control (SLC) pumps simul-taneously.
At the minimum allowable single pump pumping rate (41.2 gpm),
and with two pumps operating, a 13.6X sodium pentaborate decahydrate concentration will provide the required equivalent injection rate.
Maintenance of the SLC solution volume and concentration within the limits established ensure that the single pump shutdown and ATMS requirements can be met.
WASHINGTON NUCLEAR - UNIT 2 B 3/4 1-4 Amendment No.
43
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lal 13 4587 HlbH LFYEL ALARI1 aaciow or. nvnAovan
- VOLUME COHCFHlAAIIOH::
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+L NATRGIH OYERFLOW YOLUt1E 5150 4500 4600 4700 4800 4900 5000 5100 5200 5300 NET TANK YOLUI1E (GALLONS)
SODIIjt1 PENTADORATE TANK, VOLUI'IE VS. CONCENTRATION REQUIREMENTS O
FIGURE 3.1.5-2
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g 12O I-K 1OO I-80 I-K 60 lO RO 40 O
20 150 MINIMUM CONCENTRATION LINE ACCEPTABLE TEMPERATURE REGION SATURATION uNE SATURATED SOLUTION 0
0 10 20 30 '0 SOLUTION CONCENTRATION (% BY WEIGHT) 50 SODIUM PENTABORATE SOLUTION SATURATION TEMPERATURE FIGURE 3.1.5-1 WASHINGTON NUCLEARUNIT2 3/4 1-21 Amendment No. 43