ML20070K484
| ML20070K484 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 12/20/1982 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20070K473 | List: |
| References | |
| NUDOCS 8212300194 | |
| Download: ML20070K484 (3) | |
Text
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f UNITED STATES
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i NUCLE #.R REGULATORY COMMISSION
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WASHINGTON, D. C. 20555
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y SAFETY EVALUATION AMENDMENT NO. 5 TO NPF-13 GRAND GULF NUCLEAR STATION, UNIT 1 DOCKET NO. 50-416 Introduction The licensee proposed changes to the License for Grand Gulf Unit I which are as follows:
a) Technical Specifications 3.4.9.1 and 3.4.9.2, Limiting Conditions for Operation of the Residual Heat Removal System (MP&L letter dated September 13,1982).
b) License Condition 2.C.12.c, Environmental Qualification (MP&L letter dated September 13, 1982).
Evaluation a) Residual Heat Removal System The licensee has requested a change in the Technical Specifications relating to the residual heat removal (RHR) systems to reflect credit for having at least one recirculation pump in operation during hot and cold shutdown conditions. In the current BWR Standard Technical Specifications (STS), we recognize the capability of the recirculation pumps for these conditions and have approved the BWR STS to include the operation of at least one recirculation pump as an equal alternate for the recirculation of reactor coolant to prevent temperature stratification.
Regarding adequate mixing or stratification, the recirculation pumps are preferable to a shutdown cooling loop in operation due to the h'gher flow rates and the more direct flow path. RHR shutdown cooling is effective in providing mixing; however, the recirculation pump offers obvious advantages in assuring that the coolant within the reactor pressure vessel is adequately mixed. We find the proposed changes to the Technical Specifications to be in accordance with the current BWR STS and, therefore, are acceptable.
b) Environmental Qualifications The licensee has requested a change in the schedule for completion of open items and corrective actions for the environmental qualification of safety-related electrical equipment. When our previous safety evaluation report was issued on this subject, we had requested that the open items and corrective actions be completed by Septert>er 15, 1982. Our completion date had been selected on the basis of the licensee's projected schedule for the plant completion and its readiness to proceed above the 5% thermal power level.
Since that time, the plant schedule has slipped considerably. On September 13, 1982, the licensee requested a change in the license condition to be more in line with the projected power ascension schedule.
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4 For the implementation of the identified aging requirements, the licensee requested a change in the schedule for the completion of these requirements 4
l prior to exceeding 5% thermal power. For our concern associated with aging requirements, the licensee had developed a plan for surveillance and maintenance to ensure that equipment would not degrade sooner than predicted. We had reviewed the outline of that plan and reported in the Grand Gulf Safety j
Evaluation Report, Supplement No. 2, dated June 1982, that the plan was acceptable. We stated that the surveillance and maintenance program procedures were to be implemented before full power operation. The licensee has committed 1
to implement these requirements prior to exceeding 5% power. We find this commitment acceptable.
l For the equipment identified as requiring additional information and/or i
corrective action, the licensee has requested a change in the schedule for completion of these items prior to the end of the first refueling outage.
This involves equipmant for which full qualification documentation does not yet exist. Commission Memorandum and Order (CLI 80-21) provides for justi-fication for interim operation with equipment without full qualification documentation. The licensee has provided justifications for interim operation i
with this equipment. We have reviewed the justifications and find them acceptable. Therefore, we find the change in the schedule to the first refueling outage to be acceptable.
I For the identified equipment requiring replacement or modification to justify interim operation, the licensee has requested a change for the completion of these items prior to exceeding 5% thermal power. Operation l
from fuel load up to 5% power will not involve a significant buildup of fission product inventory or decay heat, thus, the consequences of any accident will be greatly diminished during the low power operating period.
The malfunction of any of this equipment would not alter significantly the consequences of any postulated accident assumed to occur during this i
i period of operation. Therefore, we find this change in the completion j
schedule for these items to be acceptable.
Environmental Consideration We have determined that this amendment does not authorize a change in effluent l
types or total amount nor an increase in power level and will not result in any l
significant environmental impact. Having made this determination, we have i
further concluded that this amendment involves action which is insignificant I
from the standpoint of environmental impact, and, pursuant to 10 CFR Section 51.5(d)(4), that an environmental impact statement or negative declaration and environmental impact appraisal need not be prepared in connection with the l
issuance of this statement.
. Conclusion We have concluded, based on the considerations discussed above, that:
(1) because the amendment does not involve a significant increase in the probability or consequences of accidents previously considered and does not involve a significant decrease in a safety margin, the amendment does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety 'of the public will not be endangered by operation in the proposed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.
Dated: December 20, 1982 i
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