ML20058E323
| ML20058E323 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/01/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20058E320 | List: |
| References | |
| GL-88-17, NUDOCS 9011070126 | |
| Download: ML20058E323 (2) | |
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NUCLEAR REGULATORY COMMISSION y r, J t
- WASHINGTON, D. C. 20555 W-5 c...,e 4
SAFETY EVALUATION BY T'HE OFFICE OF NUCLEAR REACTOR REGULATION' RELATED TO AMENDMENT NO.138 TO FACILITY OPERATING LICENSE NO. DPR-51 ENTERGY OPERATIONS. INC.
ARKANSAS NUCLEAR ONE, UNIT NO. 1 DOCKET NO. 50-313-s INTRODUCTION-By letter dated May 22, 1990, Arkansas Power and Light Company requested an
- amendment to the Technical Specifications (TSs) appended to Facility Operating
-License.No.DPR-51forArkansasNuclearOne,-UnitNo.1(ANO-1).
The proposed amendment'would modify TS 3.1'.2.10 to allow the use of high pressure injection cfor emergency RCS makeup during. decay heat removal operations. The change is associated with Generic Letter 88-17, Loss of Decay Heat Removal, dated October 17, 1988, which recommends identification of. sources of water injection into g
the reactor vessel that are in addition to pumps that are a part of the normal
? decay heat: removal-(DHR) system.- For ANO-l' the additional source identified for emergency use'is a high pressure pump.,The staff evaluation of the request' is discussed below.
' EVALUATION
'TS 3.1'.2.10 of-the ANO-1; Technical Specifications currently requires that when
- the-reactor coolant temperature-is less than 280*F, the four High Pressure Injection.(HPI) motor operated valves shall be closed with their opening control circuits for the motor operators disabled.
This condition was i
identified-and approved as part of the staff evaluation in Amendment No'. 95 to
- FacilityOperatingLicenseNo.DPR-51(ArkansasNuclearOne-Unit 1). The requirement'was imposed in'1985 as a consequence of-prior staff. review of the Low Temperature Overpressure Protection (LTOP) for ANO-1 and was to ensare that
-high pressure injection is not the source of pressurizing the reactor coolant' system when in cold shutdown. -The current specification allows. exceptions for ASME Section XI. testing, fill and vent of the reactor coolant system (RCS),
and maintenance of the valves.
As a consequence of recent considerations related to loss of decay heat removal.(Generic Letter 87-12) and plant operation with a reduced reactor coolant system,(RCS), inventory, the staff has issued Generic Letter 88-17 which presents recommendations to improve plant designs in this area. The change proposed by AP&L in this amendment request would insert the words
" emergency RCS makeup" to the list of exceptions to disabling of the valve motor operators.
Under the proposal, the HPI system would be available as a source. of inventory control while in decay heat removal operations.
Procedural
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-controls currently in' place ensure that overpressure does not occur by
> instructing the operator to throttle HPI to prevent exceeding LTOP-limits and by using the valve,nly-after other sources of inventory addition have
.been' utilized. We have verified this through a review of Plant Operating Procedure 1203.28 Attachment F, "HPI Pump from BWST through Normal Nakeup, RCP Seal Injection, or HPI Block Valves" which includes the following steps:
- Step'2
If racked down, rack in breaker for selected HPI pump.
3 Step 5:
Unlock and open HPI pun.p discharge X-over valves as necessary to:
align: HPI pumps to normal makeup path.
. Step 8:.
Start HPI' pump.
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Step 13 C:-
Open HPI block valves as necessary to increase RCS. inventors and avoid NDTT limits per OP 1102.02, Attachment A.
The Technical Specification change request is acceptable as envisioned as a programed enhancement in Generic Letter 88-17; specifically, it is res to Recc m endation 3.5.1, which states, " Technical specifications.(TSs) ponsive that restrict or limit the safety benefit of the actions identified in this letter R
should:be identified and appropriate changes should be submitted."
The staff finds the-licensee's proposal acceptable to the extent that it makes
. appropriate changes to remove prior restrictions or limitations in response to concerns raised by Generic Letter 88-17, Section 3.5.1.
- Based on our review as' discussed above, the staff concludes that the. proposed 1
TS ch nge is responsive to the recomendation in Generic Letter 88-17 to provide a high1 pressure injection pump as an emergency source of adding inventory to the RCS, procedures-for the use of the systems are provided in
- accordance with the recomendation, and the LTOP provisions approved in License
' Amendment No. 95 are not' compromised.- We therefore find the. proposal acceptable.
ENVIRONMENTAL CONSIDERATION The' amendment involves a change in' a requirement with respect to the.installa-l tion or use of a facility component located within the restricted area as
. defined in 10 CFR Part 20 and cha_nges in surveillance requirements. The. staff-
- has determined 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 is no significant increase in individual or cumulative occupational radiation exposures. The' Commission has previously issued a proposed finding that the amendment involves no significant hazards consideration and there has been no public coment'on such finding. Accordingly, o
the. amendment meets the eligibility criteria for categorical exclusion set
- forth:in 10 CFR Section 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 amendment.
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3 CONCLUSION The staff has concluded, based On the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the will not be endangered by operation in the pro)osed manner, and (2) public such activities will be conducted in compliance wit) the Commission's regulations and the issuance of the amendment will not be inimical to the common defense, and security or to the health and safety of the public.
Dated: November 1,1990 1
Principal Contributor:
M. McCoy, SRXB 1
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