ML20235T544
| ML20235T544 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/01/1989 |
| From: | Reeves E Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20235T547 | List: |
| References | |
| NUDOCS 8903080346 | |
| Download: ML20235T544 (5) | |
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' UNITED STATES' NUCLEAR REGULATORY COMMISSION SYSTEN ENERGY RESOURCES,c INC., et al.
DOCKET'NO. 50-416 4
GRAND GULF NUCLEAR STATION, UNIT 1 ENVIRONMENTAL ~ ASSESSMENT'AND FINDING OF
-NO SIGNIFICANT IMPACT The U. S. Nuclear' Regulatory Consission (the. Connission) 'is considering -
' issuance of.an amendment to. Facility Operating License No. NPF-29f issued to SystemsEnergyResources,Inc..et.al.(thelicensee),foroperationofthe
' Grand Gulf Nuclear Station, Unit 1, located in C15fborne County, Mississippi.
ENVIRONMENTAL ASSESSMENT
= Identification'of Proposed Action:
.The Technical Specifications (TS) Section 4.7.4-concerning surveillance requirements'for snubbers contain three alternative sampling plans, one of
.which must. be selected prior to surveillance testing of snubbers. P1an No.:1 requires. at least 10% of the total number of each type of snubber to be functionally tested.
If acceptance criteria are not met,-an additional 5% are required to be tested until no failures are found or until all snubbers lare tested.
Plan No. 2 requires an initial sample of at 'least 37 snubbers to be tested. The plan contains criteria for acceptance of the remainder of the
-untested population, criteria for continued testing, and rejection criteria.
Rejection criteria require that if the number of failures exceeds a specified small percentage of snubbers tested (7.5% to 10%), then all the remainder of.
. the snubbers must be tested. Plan No. 3 requires an initial sample of at least 55 snubbers to be tested. For each snubber which fails to meet acceptance criteria another sample of at least i the size of the initial sample is required s903080346 890301 PDR ADOCK 05000416 P
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1 to be tested until the total number tested equals the initial sample size times the factor (1 + C/2) where C is the number of failed snubbers. Testing continues until acceptance criteria are met or until all snubbers are tested.
The proposed amendment would revise the provisions in the Technical Specifications (TS) relating to Section 4.7.4 concerning surveillance requirements for snubbers by:
(1) changing sampling plan No. 2 to eliminate the requirement to test all snubbers if the number of test failures exceeds a specified number, and (2) deleting sampling plan No. 3. In addition, the Bases for TS 3/4.7.4 would be changed to reflect the TS changes.
The proposed action is in accordance with the ifcensee's application for amendment dated July 25, 1989.
The Need for the Proposed Action:
The proposed change to snubber sampling plan No. 2 is needed to reduce radiation exposure to testing personnel by eliminating unnecessary surveillance testing of 100% of the snubbers. The surveillance testing verifies that the snubbers are capable of maintaining the structural integrity of safety related systems during an earthquake or other events resulting in dynamic loads.
Sampling plan No. 2 would still require an initial sample of 37 snubbers and j
continued testing until either the acceptance criteria are met or all the snubbers are tested. The proposed change does not change the acceptance criteria for continued snubber testing.
The proposed change would eliminate the rejection criteria, which require testing of 100% of the snubbers if a small number of the sample tested do not meet the acceptance criteria. The elimination of the rejection criteria without changing acceptance criteria will 1
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result in an insignificant increase in the probability of accepting snubbers that do not meet acceptance criteria. The radiction exposure accumulated during the first refueling outage for snubber inspections using sampling plan No. 2 was 3.2 man-rem and during the second refueling outage the radiation exposure for : snubber inspection was 29 man-rem.
The projected potential exposure for the third refueling outage, without the proposed change is 60.2
- man-rem. The proposed change to sampling plan No. 2 will reduce radiation exposure by eliminating unnecessary surveillance testing of snubbers.
The proposed elimination of sampling plan No. 3 is requested to simplify the TS. This plan has not been used and there is no need for it in future testing.
Environmental Impacts of the proposed Action:
The Commission has completed its evaluation of the proposed revision to the TS and concludes that the proposed 1S would provide a small increase in the probability of operating with snubbers that do not pass functional tests, but the increase is not significant. Therefore, the proposed amendment does not significantly increase the probability or consequences of any accident.
The Commission also concludes that the amendment involves no significant increase in the amounts and no significant change in the types of any effluents that may be released offsite and that there should be no significant increase in individual or cumulative occupational radiation exposure because the proposed change would reduce radiation exposure of testing personnel. Accordingly, the Commission concludes that this proposed action would result in no significant radiological environmental impact.
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4-With regard to potential non-radiological impacts, the proposed change to the TS involves requirements with respect to installation or use of a facility component located within the restricted area as defined in 10 'CFR Part 20.
It does not affect non-radiological plant effluents and has no other environmental impact. Therefore, the Commission concludes that there are no 1
significant non-radiological environmental impacts associated with the proposed amendment.
Alternative to the Proposed Action:
Since the Commission concluded that there are no significant environmental effects that would result from the proposed action, any alternatives with equal or greater environmental impacts need not be evaluated.
l The principal alternative would be to deny the requested amendment. This would not. reduce environmental impacts of plant operation and would result in increased radiation exposure of snubber testing personnel.
Alternative Use of Resources:
This action does not involve the use of any resources not previously considered in the " Final Environmental Statement related to the operation of Grand Gulf Nuclear Station, Units 1 and 2," dated September 1981.
Agencies and Persons Cons'lted:
u The NRC staff reviewed the licensee's request and did not consult other agencies or persons.
FINDING 0F NO SIGNIFICANT IMPACT The Commission has determined not to prepare an environmental impact statement for the proposed license amendment.
Based upon the foregoing environmental assessment, we conclude that the proposed action will not have a significant effect on the quality of the human environment.
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'For further details with respect to this action, see the application for amendment dated July 25, 1988, which is available for put,1ic inspection at.the Commission's Public Document Room, 2120 L Street, N.W., Washington, D.C. and at the Hinds Junior College, McLendon Library, Raymond, Mississippi 39154.
Dated at Rockville, Maryland, this
?lst day of-March 198.
FOR.THE: NUCLEAR REGULATORY COMMISSION P
Edward A. Reeves, Acting Director Project Directorate II-1 1
. Division of Reactor Projects I/II
,0ffice of Nuclear Reactor Regulation f
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