ML20215A909
| ML20215A909 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 09/22/1986 |
| From: | Julie Ward SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20215A912 | List: |
| References | |
| JEW-86-359, TAC-63083, NUDOCS 8610060284 | |
| Download: ML20215A909 (5) | |
Text
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hSMU-SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S Street. P.O. Box 15830, Sacramento CA 95852-1830,(916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CAltFORNIA JEW 86-359 September 22, 1986 DIRECTOR OF NUCLEAR REACTOR REGULATION ATTENTION FRANK J MIRAGLIA DIRECTOR PWR-B DIVISION l
U S NUCLEAR REGULATORY COMMISSION WASHINGTON DC 20555 D0CKET NO. 50-312 LICENSE N0. DPR-54 PROPOSED AMENDMENT N0. 145 In accordance with 10 CFR 50.90, the Sacramento Municipal Utility District proposes to amend its Operating License DPR-54 for Rancho Seco Nuclear Generating Station Unit No. 1.
Proposed Amendment No.145 consists of 1) a revisior%to Specification 1.2.8 (Refueling Interval) of the Technical Specifications making the wording consistent with the Standard Technical Specifications, and 2) extension of the waiver on surveillance of the internal vent valves to the Cycle 8 refueling.
Details of these proposed changes are dicussed in Attachments I, II and III which constitute the Safety Analysis, "No Significant Hazards" Evaluation, and Description of Proposed Changes, respectively.
Pursuant to 10 CFR 50.91 (b)(1), the Radiological Health Branch of the California State Department of Health Services has been informed of this proposed amendment by mailed copy of this submittal.
Enclosed is a check in the amount of $150.00 as required by 10 CFR 170.21,
" Schedule of Fees."
The District requests prompt review of this proposed amendment since surveillance of the internal vent valves, if disapproved, would have to be performed before restart of the plant.
If approved, the District further requests that the
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3.25 factor applicable to three consecutive time intervals be reset to begin after the next surveillance.
wo 38 Should you require any further information with respect to this Proposed mo Amendment, please contact Mr. Ron W. Colombo at Rancho Seco Nuclear Generating Station Unit No. 1.
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O SACRWENTO county l' My Cemn Epires Jan.12, [990 0 l q 4 'O R E WA D Subs eme - i DEPUTY GENERAL MANAGER this 2.2 day of Scrfe,yd)ey; 1986. Mg NUCLEAR 6 N Attachments &Lhn GhhD f W' cc: Region V (2); MIPC (2); INP0 Notary Public ~
ATTACHMENT I SAFETY ANALYSIS Proposed Amendment No. 145 consists of two changes to the Technical Specifications with respect to " Refueling Interval." These changes and their effect on plant safety are addressed below: 1. Specification 1.2.8, Refueling Interval, is presently defined as follows: " Time between normal refuelings of the reactor, not to exceed 24 months for the first refueling and 18 months thereafter without prior approval of the NRC." Reference to the "first refueling" no longer applies, and the remaining wording is inconsistent with the Standard Technical Specifications (STS). Accordingly, it is proposed to delete the present wording of Specification 1.2.8 in its entirety and replace it with "18 months", the equivalent wording in STS Table 1.2. This change, considered to be purely administrative, is judged to have no involvement with plant safety or affect in any way the health or safety of the general public. 2. A waiver on surveillance of the internal vent valves was issued by the NRC on January 22, 1985 as Amendment No. 59. Because this waiver expired at the end of the 1985 refueling outage, its deleting is proposed.
- Instead, for the reasons presented below, a waiver until the Cycle 8 refueling is requested for the next inspection of the internal vent valves.
a. Specification 4.1.2 and Table 4.1-2, Item 13, require inspection of the internal vent valves each refueling interval. This surveillance frequency is based on a presumption that meaningful operating time will have accrued on the valves during the interval between inspections. The internal vent valves were last inspected in April, 1985 and by present technical specification requirements are again due to be inspected before restart of the plant. However, only approximately two months of plant operation has accrued since the last inspection. Reinspection of the internal vent valves after such a short duration of plant operation is considered unwarranted. b. Surveillance of the internal vent valves requires removal of the Reactor Vessel Head, estimated to result in about 25 manrem exposure. Inspection of the internal vent valves would add approximately 5 manrem exposure. The District considers the deferral of the internal vent valves inspections, a savings of approximately 30 manrem exposure, to be consistent with maintaining personnel exposure to as low as reasonably achievable. c. According to site records, the surveillance of internal vent valves in the past has not revealed any significant abnormalities. Therefore, it is reasonable to assume that inspection of the internal vent valves after only approximately two months of plant operation would continue to reveal no functional problems.
ATTACHMENT I For the reasons presented above, the District considers it prudent to postpone the next surveillance of the internal vent valves until the Cycle 8 refueling. The District considers this request to be reasonable and judged to not present any health or safety problems to the general public.
f ATTACHMENT II "N0 SIGNIFICANT HAZARDS" EVALUATION Proposed Amendment No. 145 consists of 1) a proposed redefining of " Refueling Interval" to simply, "18 months", and 2) requesting an extension of the time between surveilling the internal. vent valves beyond the normal 18 months interval. The District has reviewed the proposed changes against each of the criterion of 10 CFR 50.92 and concluded that plant operation upon implementation of the changes would not: i
- a. involve a significant increase in the probability or consequences of an accident previously evaluated.
The first change, redefining " Refueling Interval" is purely administrative and is not seen to have any involvement with a previously evaluated accident. The second change, extending the interval between inspections of the internal vent valves, is considered unlikely to increase the probability or consequences of an accident previously evaluated since previous periodic inspections dating back to 1974 have revealed no significant abnormalities in the valves. b.createthepossibilityofanewordifferentkind'ofadcidentfromany i previously analyzed. Neither of the two proposed changes involve new plant design or affect operating procedures. Therefore, th'e creation of a new or different kind of accident from any previously analyzed is rat foreseen.
- c. involve a significant reduction in a margin of safety. The first change, being purely administrative, has no involvement with plant safety, and therefore, cannot be seen as affecting any margins of safety. The second change, which extends the time period between inspections of the internal vent valves, is considered unlikely to reduce any margins of safety because past inspections have not revealed any significant abnormalities in these valves.
Based on the above considerations, the District has concluded that there is reasonable assurance that the proposed changes to the Technical Specifications do not constitute a significant hazard to the health and safety of the public. l
B B 4 ATTACHMENT III DESCRIPTION OF PROPOSED CHANGES 1. Specification 1.2.8, Refueling Interval, page 1-2: Deleted the wording in its entirety and replaced with: "18 months". 2. " Refueling Interval", page 1-2b: Changed " defined to be 24.5 months" to: " extended to the Cycle 8 refueling outage." Also changed "1985" at the bottom of the page to: " Cycle 8". 'l l l 4 i i I t 1 -.}}