ML20114A943
| ML20114A943 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/12/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20114A940 | List: |
| References | |
| NUDOCS 9208240144 | |
| Download: ML20114A943 (4) | |
Text
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NUCLEAR REGULATORY COMMISSION 2
WASHINGTON, D. C. 2(.555
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SAFETY EVALVATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED 10 AMENDMENT NO. 74 TO FAClllTY OPEPATING llCENSE NO. DPR-80 AND AMENDMENT N(L 73 TO FACillTY OPERATING llCENSE_NO. DPR-82 Pacific GAS AND ELECTRIC COMPANY DIABLO CANVON NUCLEAR POWER PLANT. UNITS 1 AND 2 DOCKET NOS. 50-275 AND 50-323 1.0 INTPODt)1110fj By letter of February 14,199?, as supplemented by letter dated June 5. 1992 (Reference LAR 92-03), Pacific Gas and Electric Company (PG&E, or the licensee) submitted a request for changes to the Technical Specifications (TS). The proposed amendments would change TS 3/4.8.1, "A.C. Sources, Operating," and TS 3/4.8.2, "A.C. Sources, Shutdown," concerning the emergency diesel generator (EDG) fuel oil volume requirements during the 10 year tank draining, cleaning, and inspection surveillance at Diablo Canyon Units 1 & 2.
TS 3.8.1.1 and 3.8.1.2 require that a volume of fuel oil be maintained to support operation of the EDGs.
The applicable guidance of Rogulatory Guide 1.137, ANSI Standard N195-1976, and Standard Review Plan Section 9.5.4, "EDG Fuel Oil Storage and Transfer System," states that a minimum seven-day fuel oil supply is required to be on site to meet the engineering safety equipment loads following a loss of offsite power and a design basis accident.
The proposed TS change would increase the required quantity of stored EDG fuel oil for plant operation in Modes I through 6.
This would allow the fuel oil j
storage tanks to be taken out of service sequentially for draining, cleaning, l
and inspection to meet the 10 year surveillance requirements of TS 4.8,1,1.3.e.
During the 10-year surveillance, one unit will be in an outage and one fuel oil tank will be removed from service.
The required fuel oil supply provided for one unit operation wousd support operation for the two dedicated diesel generators for a period of four days. Additional temporary onsite fuel oil storage would be provided to support EDG operation for another 3 days.
The June 5,1992 submittal provided clarifying information on the amendments, including footnotes to the TS.
Inclusion of these footnotes is within the scope of the initial notice and does not affect the Commission's initial determination.
2.0 EVALUATION The current Diablo Canyon TS 3.8.1.1.b.2 requires that the combined fuel oil storage for one unit operation in Modes 1 through 4 be maintained at a minimum 9200240144 920812 PDR ADOCK 05000275 P
- -~
- of 31,023 gallons.
The proposed TS combined fuel oil storage reauirement will increase this quantity to 33,000 gallons.
Cunent TS Section 3.8.1.2,b.2 requires that storage of the EDG fuel oil for one unit operation in Mode 5 or 6 be maintained at a minimum of 8,000 gallons. The proposed TS combined fuel oil storage requirement will increase this quantity to 26,000 gallons.
Combining _the proposed-TS requirement of 33,000 gallons fuel oil for the operating unit in Modes 1 through 4 with the proposed TS requirement of 26,000 gallons fuel oil storage for the second unit in Mode 5 or 6 results in a total fuel oil inventory of 59,000 gallons. This volume of available fuel oil will provide sufficient fuel for the diesel generators to power the minimum electrical safety equipment loads for seven days.
The combined storage of EDG fuel oil for operation with both units in Modes 1 through 4 is currently required by the TS to be at least 52,046 gallons.
The proposed TS-fuel oil storage requirement will increase this amount to 65,000 gallons to maintain operation in Modes 1 through 4 for a period up to seven days.
This increase in fuel oil quantity would provide sufficient fuel for
-the diesel generators and power for the operation of emergency system and engineered safety features (ESF) systems required to achieve a safe shutdown following a loss of cooling accident (LOCA) in one unit and to maintain the second unit in a safe shutdown condition.
PG&E proposed a TS~ footnote to define the oil storage requirements while one tank is removed from service to perform TS Surveillance Requirement 4.8.1.1.3.e.
TS Surveillance Requiremen 4.8.1.1.3.e requires one fuel oil tank to be removed from service for draining, cleaning, and inspection on a 10-year frequency.
During the surveillance, the diesel generator fuel oil requirements for one unit operation in Modes 1 through 4 and one unit operation ~ in Mode 6, with a.t least 23 feet of water above the reactor vessel flange or with the reactor defueled,. is 35,000 gallons.
The 35,000 gallons of fuel oil available will reduce the required seven-day supply necessary to power.the ESF systems to four days, The licensee has committed to provide temporary onsite fuel oil storage to accommodate an a'.itional 24,000 gallons (i.e., fuel tankers, temporary storage facility, and auxiliary boiler fuel storage' tank).
The additional fuel' oil will be available to replenish the tank inventory, if needed. The 24,000 gallons of temporary fuel oil storage combined with the 35,000 gallons fuel oil required during the 10-year surveillance wil.1 provide sufficient fuel oil storage for the diesel generator-to powe_r the minimum ESF electrical-loads for seven days. The fuel oil storage tank surveillance will be performed with one unit in Modes 1 through 4 and the other unit in Mode 6 with at least 23 feet of water above the reactor vessel flange or with the reactor defueled.
The same fuel oil requirements apply (59,000 gallons) if the second unit is in Mode 5.
The staff has reviewed the proposed temporary fuel oil storage measures submitted by the licensee to ensure continued operation of the common mode tank and diesel generators and consider the measures to provide temporary onsite fuel oil
+
storage acceptable.
In summary, the staff finds the proposed amendment to TS Sections 3/4.8.1 and 3/4.8.2, the addition of the footnote, and the paragraph added to the Bases Section 3/4.8.3 to be aopropriate to ensure that an adequate amount of fuel
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,, of 31,023 gallons.
The, proposed TS combined fuel oil storage requirement will
= increase this quantity to 33,000 gallons.
Current TS Section 3.8.1.2.b.2 requires that storage of the EDG fuel oil for one unit operation in Mode 5 or 6 be maintained at a minimum of 8,000 gallons.
The proposed TS combined fuel oil storage requirement will increase this quantity to 26,M0 gallons.
Combining the proposed TS requirement of 33,000 gallons fua oil for the operating unit in Modes 1 through 4 with the proposed TS requirement of 26,000 gallons fuel oil storage for the second unit in Mode 5 or 6 rc 'its in a total fuel-o l inventory of 59,000 gallons. This volume of availab fuel oil will i
provide suffit.ent fuel for tha diesel generators to power the minimum electrical safety ~ equipment loads for seven days.
The' combined storage of EDG fuel oil for operation with both units in Modes 1 through 4 is currently required by the TS to be at least 54,046 gallons.
The proposed T5 fuel oil storage requirement will increase this amount to 65,000 gallons to maintain operation in Modes 1 throcgh 4 for a period up to seven days. This increase in fuel oil quantity would provide sufficient fuel for the diesel' generators and power for the operation of emergency system and engineered safety features (ESF) systems required to achieve a safe shutdown following a loss of cooling accident (LOCA) in one unit and to maintain the second unit in a safe shutdown condition.
PG&E proposed a TS footnote to define the oil storage requirements while one tank is removed from service to perform TS Surveillance Requirement 4.8.1.1.3.e.
TS Surveillance Requirement 4.8.1.1.3.e requires one fuel oil tank to be removed from service for draining, cleaning, and inspection on a 10-year frequency. During the surveillance, the diesel generator fuel oil requirements for one unit operation in Modes 1 through 4 and one unit operation in Mode 6, with at least 23 feet of water above the reactor vessel
- flange or with the reactor defueled, is 35,000 gallons.
The 35,000 gallons of fuel oil available will reduce the required seven-day supply necessary to -
power the ESF systems-to four days. The licensee has committed to provide temporary onsite fuel oil storage to accommodate an additional 24,000 gallons (i.e., fuel tankers, temporary storage facility, and auxiliary boiler fuel storage tank).
The additional fuel oil will be available to replenish the tank inventory, if needed, The-24,000 gallons of temporary fuel oil storage combined with the 35,000 gallons fuel oil required during the 10-year surveillance will provide sufficient fuel oil storage for the diesel generator to power the minimum ESF el_ectrical loads for seven days. The fuel oil storage tank surveillance will be performed with one unit in Modes 1 through 4 and the other unit in Mode 6 with at least 23 feet of water above the reactor vessel flange or'with the reactor-defueled.
The same fuel oil requirements apply (59,000 gallons) if the second unit is in Mode 5.
The staff has reviewed the' proposed temporary fuel oil storage measures submitted by the l
licensee to ensure continued operation of the common mode tank and diesel generators and-consider the measures to provide temporary onsite fuel oil storage acceptable, j
In summary, the staff finds the proposed amendment to TS Sections 3/4.8.1 and L
3/4.8.2, the addition of the footnote, and the paragraph added to the Bases l
Section 3/4.8.3 to be appropriate to ensure that an adequate amount of fuel l
.. =
l
,' oil inventory to'the diesel generators during the 10-year surveillance for
- draining, cleaning, and inspection of the storage tanks sequentially is
! maintained.
The staff concludes, base 1 on its evaluation, that the licensee's proposed amendme ~ to-TS Section 3.8.1.1.b.2 and 3.8.1.2.b.2 with the compensatory meastres for available-temporary fuel oil storage onsite conforms to Regulatory Guide 1.137, ANSI Standard N195-1976, and Standard Review Plan Section-9.5.4 and, is therefore, acceptable, 3.0 STATE CONSULTAIJpH
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In accordance with the Commission's regulations, the California State official was; notified of the proposed issuance of the amendments.
The State official had no comments.
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4.0 ENVIRONMENTAL CONSIDERATION
These amendments change a requirement with respect to the installation or use of a facility component located within the-restricted area as defined in 10 CFR Part 20 and changes surveillance requirements.
The NRC staff has
- determined that the~ amendments involve no significant increase in the amounts, and no significant change in the types, of. any effluents that may be released offsite and that there is no significant increase in individual or cumulative occupational: radiation exposure.
The Commission has previously issued a proposed finding that the amendments involve,no significant hazards considera-tion, and there has been no public comment on such finding (56 FR 11113).
Accordingly, the amendments meet the eligibility criteria forfcategorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental' impact statement or environmental assessment need be prepared in connection with the issuance of the amendments-.
5.0 : [0NCLUS10N The Commission has concluded,-based on-the considerations discussed above, that (1) there is reasonable assurance that the health and safety of the public will not be' endangered by operation in the proposed manner,- (2) such activities will be conducted in compliance with the. Commission's regulations,
.and (3) the issuance of the amendment will not be inimical to the common defense'and' security or to the health and safety of the public.
Principal Contributors:
-M.
Widmann C. Regan Date: August 12, 1992