ML20062B189
| ML20062B189 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 10/12/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20062B187 | List: |
| References | |
| NUDOCS 9010240105 | |
| Download: ML20062B189 (2) | |
Text
.
. dreag L.
if
.,o t ' *.
'g UNITED STATES
'E
. NUCLEAR REGULATORY COMMISSION o
3
.[
wassiwoToN, D. C. 20665 i
- %...../
l SAFETY EVALUATION BY THE.0FFICE OF NUCLEAR REACTOR REGULATION U
)
- RELA 1ED TO AMENDMENT NO. 75 TO FACILITY OPERATING LICENSE-NO. OPR-22
)
NOR1hERN. STATES-POWER COMPANY MON 11 CEL L 0, p,0C}.,EA,R, GQE!:A]j pG,11 ANT :
DOCKET NO. 50-263
1.0 INTRODUCTION
By letter dated July 31, 1990, horthern States Power Cotopany (the licensee) requested an an.ei.dn.ent to the Technical Specifications (TSs) aprended to~ Facility Operating License No. DPR-22 for the Monticello Nuclear Generatir9 plant. The proposed amendcent would revise the niinimun. quantity of diesel oil required to be availeble in the storage tank from 26,250 gallons to 32,500 gallons.
The amendment would also i
c11.tify that " full 10ad," for purposes of the ditstl oil storage tank capecity calculation, is 2500 rW.
A discussion of the proposed changes and the NRC st J f's evaluation and findings relative to each are addressed in Section 2 of this Safety Evaluation Report.
2.0 D1500SS10N AND EVALUATION On May 30,1990, the staff issued NRC INFORMATION NOTICE NO. 89-50 "lNADEQUATE ENERGENCY DIESEL GENERATOR FUEL SUPPLY" advisir.g licensees of the need to update fuel oil consumption calculations to reflect changes in equipn.ent loading and operating times. Monticello's subsequent investigation concluded that the niinin.um oil storage tank level in the fecility Technical Specifications, based on operating one emergency diesel generator at full load (2500 KW) for seven days, is low. The Technical Specifications presently requires a minimum level corresponding to 26,250 gallons. The amount of diesel fuel required to operate one emergency diesel generator at 2500 KW for seven days is 31,248 gallons.
Staff guidance for the calculation of fuel oil storage requirements.is set forth in Regulatory Guide 1.137 " Fuel-011 Systems for Standby Diesel Generators" which invokes the guidance of ANSI N195-1976 " Fuel Oil Systems for Standby Diesel Generators," Section 5.4.
The guidance states that either of two methods may be used; (1) the calculation may assune that a diesel generator operates continucusly at rated capacity for seven days, or (2) the calculation tray be time-dtpendent based predicted time-dependent loads. The licensee's proposed changes are consistent with cption (1) of the staff guidance, and are therefere acceptable.
9010240105 901012 PDR ADOCK 05000263 z
P PDC
It is r,cted that the actual cepatity of the Monticello underground diesel oil storage t6nk is 60,000 g611ons and fluid level is a.tintained above tte icw level alarrr. setpcints (40,330 gallons (LOW) and 35,575' gallons-(LOW-LOW)). This practice provides 6dditional s.argin with respect to Technical Specificetions coinpliance and, iri event of a design b6 sis event would 6150 provide sufficient diesel oil availability to pernit liinited cperation of selected non-safety related equipinent such as tht: plant heating boiler, ditsel fire puitp, etc. Thete features are acceptable.
3.0 ENVIROWENTAL C0h51DEkA110h This arnendnient involves a change in the installation or use of a facility curtponent located within tht restricted area es defined in 10 CFR Part 20 or ct14riges an inspection or surveiller.ce requirentent. Vt have deterniirit.d th6t the enendrient involves no significant incruse in the enounts, and tic sigt.ific6r.t chbrige in the types, of any effluer,ts th61 mi6) be releestd offsite, eied th6t there is no significent increase in individual or cunulative occupatio061 radietion exposure. The Con issioni has previously oblished e proposed findir g th6t this an.6tidrcent inycives t o signific6 tit haz6rds consideration end there has been no ublic connent en such findirig. Accordir. gly, this aniendment nieets the eli ibility uiteri6 for (6tegorical utlusion set forth in IC CFR 51.22(c)(9.
Pursuant to 10 CFR 51.22(b), no environnental inp6ct steter erit or environner.tti assessment ot.ed be prepared in corr ection with the issuarice of this en.endirert.
4.0 CO,K,C,LUS_10N We have concluded based or the consideratim., discussed above, that (1).
thtre, is reasonable essuran,ce that the he61th and safety of the putlic will nct be endangered by operation it,the proposed manner, erd (2) such ectivitics vill be conducted it. con. plier.ce with the Cont,ission's regu16ticos, and the issuance of this erottidnent will rct be ininiic61 to the conn.on defense and security or to the ht61th and safety of the publit..
Princip61 Contributor:
W. Long Dated: October 12, 1990
,