ML20070D310

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Proposed Tech Specs 3.8.1.1 & 3.8.1.2 Re Min Storage Vols for Fuel Oil Storage Tanks
ML20070D310
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 02/22/1991
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20070D308 List:
References
NUDOCS 9102280199
Download: ML20070D310 (7)
v • d • e


Text

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l I At t achinent 2 to GNRO-91/00017

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PROPOSED CilANGE TO TiiE OPERATING LICEN$E

- REVISIONS TO TS 3.11.1.1 & 3. 8.1. 2 +

(GGNS l' COL-90/13) f d

2 9102260199 DR 910222

  • ADOCk 05000416 PDR A9012141/SNLICFLR - 6

Attachment 2 to GNRO-91/00017 A. - SUBJECT

1. NL-90/09 Revised Minimum Storage Volumes for Fuel 011 Storage Tanks
2. Affected Technical Specifications:
a. LCO 3.8.1.1.b.2 - Page 3/4 8-1
b. LCO 3. 8.1. 2.b. 2 - Page 3 / 4 8-9 B. DISCUSSION Entergy Operations Inc. As requesting tevisions to the Technical Specifications which specify the minimum fuct oil volumes to be maintained in the fuel storage tanks for Diesel Generators 11, 12 and 13.

Technical Specifications 3.8.1.1 and 3.8.1.2 currently requlte a minimum usable fuel oil volume of 57,200 gallons for Divisions I and II, and a Division 111 miniraum usable fuel oli volwne of 39,000 gallons. The new values are 62.000 and 41,200 gallons, respectively. The enclosed figure graphically depicts-(not to scale) the fuel oli storage tanks and the

-various volwnes of interest and is included only for information.

C. JUSTIFICATION

1. In accordance with Technical Specifications 3.8.1.1 and 3.8.1.2, and UFSAR commitments to Regulatory Guide (RG) 1.137 and ANSI N195-1976, the diesel generator storage tanks are required to contain sufficient fuel oil to operate each dierel generator for a duration of seven days while supplying post-LOCA maximum load demands.

Previous calculations to determine the requisite volume of fuel oil indicated that a minimum usable volume of 57,186 gallons was needed for Divisions I and 11 to provide the seven day supply. Similar analyses for Division III indicated that the minimum usable volume was 38,077 gallons.

2. Recent reanalyses of these values, using the methodologies of 3

RG 1.137 and ANSI N195-1976, have been completed using current diesel generator loading requirements for the seven day post-LOCA period, updated pump horsepower data, and revised fuel consumption

>alues. These updated analyses indicate that the required minimum usable fuel oil volume in the Division 1, 11 and 111 tanks is greater than that required _by the current Technical Specifications.

The old and new calculated values are TABLE 1 Division I & 11 Division III OLD NEW OLD NEW Minimum Usable Volume 57,186 61,914 38,077 41,158 Unusable Volume +8.200 12,976 +8,200 +2,976 Minimum Total Volume 65.386 64,890 46.277 44,134 A9012141/SNLICFLR - 7

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Attachment 2 t o GNRo 91/00017 E u

3. As indicated in the Bases for TS 3.8.1.1 and 3.8.1.2, the fuel oil l
quantity specified in the Technical Specification is the " usable i

fuel", not the minimum f uel (i.e. , usable plus unusable volurnes) in j the storage tanks. The proposed TS volume values are the calculated j

! minimum usable volume values rounded up.

4. The unusable volurne is the amount of fuel oil required to ensure l adequate fuel oil transfer pump NPSil (4 inches above pump centerline) plus the volume of fuel oil beneath the centerline of the pump suction (8 inches off the tank bottom). Therefote, there is 1 foot of unusabic fuel in the bottom of each storage tank. In j

the old calculations a value of two feet was used for the unusabic fuel oil 1cvel.

5. The existing Technical Specification fuel oil storage requirements of $7,200 gallons for Divisions I and 11 and 39,000 gallons'for Division 111 were based on an unusabic volume of 8,200 gallons of fuel in each of the tanks. This results in total fuel oil storage requirements for Divisions I and 11 of 65,400 gallons and 47,200

, gallons for Division III. The unusable volume of fuel in each of the tanks was recalculated to be 2.976 gallons. Therefore, even though the minimum required usabic volumes (i.e. Technical Specification limits) Increased, the existing total fuel oli storage surveillance procedures (considering the new unusable volume of 2.976 gallons) were and are adequate to ensure a sufficient volutne of fuel oil exists to operate the diesci generators for seven days, i 4  !

D. NO SIGNIFICANT llAZARDS CONSIDERATICN

1. Entergy Operations, Inc. la proposing that Technical Specifications 3.8.1.1 and 3.8.1.2 be revised to provide higher minimum fuel oil '

storage requirements. These revisions would ensure that seven day fuel oli supply volumes ',re-specified in the GGNS Technical Specifications.

2. The_ Commission has provided standards for determining who'ther a no ,

significant hazards consideration exists as stated in 10CFR50.92(c).  !

A proposed amendment to an operating license involves no significant hazards-if operation of the facility in accordance with the propp ed amendment would nots (1) Involve a significant increase in the probability or consequences of an accident previously ev ated: or-(2) create the possibility of a new or different kind of accident l from any accident previously evaluated or (3) Involve a significant l reduction in a margin of safety.

3. -GGNS has. evaluated the no significant hazards considerations in.Its request for-a license amendment.- -In accordance wlth 10CFR50.91(a).- l GGNS 1s-providing the following analysis of the proposed amendment-against the three standards in 10CFR$0.921
a. No significant increase in the probability or consequences of an accident previously evaluated results fron. this change.

i A9012141/SNLICFLR _ - - _ _ . _ _ _ ___________o

Attachment 2 to GNkO-91/00017 The Technical Specifications specify ri minimum fuel oil inventory to ensure that the diesel generators will be able to maintain power to the necessary compnnents and systems for at least seven days following a desly, basis accident. The seven day period complies with the requirements of ANSI N195-1976 and ,

should provide adequate time for core recovery, accident  ;

mitigation and the recovery of 1 ternate power sources or a replenishment of the fuel oil inventory. The proposed lechnical Specifleation change ensures that the minimum usable fuel oil 2 volume specified in the Technical Specifications meets the seven day supply requirement of the diesel generators. The proposed change complies with the guidance of Regulatory Guide 1.137 and ANSI N195-1976. ,

In provid!ng compliance wit n regulatory guidance and ensuring .

the fuel oil supply requirements of the diesel generator s are met, this ch4nge would not result in a signulcant inc re e r.e in the probability or cent.equences of an accident previously evaluated,

b. This change would not create the possibility of a new or different kind of accident f rom any : reviously analyzed.

Accident analyses which incorporate diesel grnerator operability and availability assume that the emergency generetor will support the requisite loads, The proposed Technical Specification change ensures that an adequate fuel 011 inventory will be availabic to support the requisite loads for seven days.

Therefore, the requested revisions will not create the

- possibility of a new or different accident from any previously caalyzed.

c. -This change would not involve a significant reduction in the margin of safety.

This change will not alter the margin of safety currently realized by our implementation of the existing Technical Specifications. As indicated in Table I above, the minimum

< total fuel oil volua,e that is presently allowed in the Divisions 1 and 11 tanks le 65,386 gallons. This value bounds _the new minimum total volume of 64.890 gallons. In addition, the minimum tota) funi oil volume cur ently allowed for Division III is 46,277 gallons. This bounds tne new minimum total volume of.

44,134 gallons. This proposed change to the Technical Specifications only redefines the values calculated for the b usable and unusable fuel 0111 volumes. The proposed change does not_ alter the availability, operability, or surveillance rtquirements for the diesel generators.

Therefore, the proposed change will not involve a significant reduction in the margin of safety.

4. Based on the above evaluation, Entergy Operations has concluded that operation in accordance with the proposed amendment involves no significant hazards considerations.

A9012141/SNLICFLR - 9

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a lues ecanlea S,aeol: 1eation V.,

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Diesel Generator Fuel Oil Storace e Tank Division I & II -

Cic voiues Nea vowe s j[p Toto' F uei Vuume = 6'c,400 Gobor t \

/ / Totoi ruei vo'ume = 64.976 Gonons , \_.

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l vsstie F uei vosome = C2.000 Gokor s ' )

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usatae f uei votume = *.,7.000 Cono* sII)

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Un uso bie F ue t - S.200 Coiions -

Unusobie ruei = 2.976 Goi:ons _-

Diesel Generator Fuel Oil Storace e Tank Division III -

Old value Nea volve f  %

R

- Total Fuel Volume = 47,200 Gallons

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Total fuel vortme = 44.176 Gallons 3 A

A Uscote Fuel voiume = 41,200 Gonons I

- - Usotue Fuel Volume = 39.000 Goliors b s

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Un usotde Fuei S,200 Go' ions UnuscDie Fuei = 2.976 Gobons {/ -

NOTES:

1. Value in tristlng Tech Specs
2. Value in TS PCOL

OL- Clo/oq 3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES A.C. SOURCES - OPERATING LIMITING CONDITION FOR OPERATION 3.B.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE:

a. Two physically independint circuits between the offsite transmission network and the onsite Class 1E distribution systes, and
b. Three separate and independent diesel generators, each with:
1. Separate day fuel tanks containing a minimum o
  • 220 gallons of

& f oco

2. A se 1trate fuel storage system containing a minimum of:

a) 4ibyMIL gallons of fuel each for diesel generators 11 and l 12, and b) 436.r004 gallons of fuel for diesel generator 13.

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3. A separate fuel transfer pump.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

ACTION:

a. With one offsite circuit of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C.

sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 h~ irs thereaf ter. Demonstrate the OPERABILITY of the remaining O's ~ ABLE diesel generators by performing Surveillance Requirement 4.8.1.1.2.a.4^ for one diesel generator at a time within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Restore the offsite circuit to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in at least I HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />,

b. 'Vith either diesel generator 11 or 12 of the above required A.C.

electrical power sources inoperable, demonstrate the OPERABILITY of the above required A.C. offsite sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. Demonstrate the OPERABILITY of the remaining OPERABLE diesel generators by performing Surveillance Requirement 4.8.1.1.2.a.4*

within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Restore the inoperabia diesel generator to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time cf initial loss or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTOOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

" Specification 4.8.1.1.2.a.4 must be performed for diesel generator 13 only when the HPCS system is OPERABLE.

GRAND GULF UNIT 1 3/4 8-1 Amendment No.j 30 --- l

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(JL-90/oq ELECTRICAL POWER SYSTEMS A.C. SOURCIS - SHUTOOWN LIMITING CONDITION FOR OPERATION 3.8.1.2 As a minimum, the following A.C. electrical power sources shall be OPERABLE:

a. One circuit between the of fsite transmission network and the onsite Class 1E distribution system, and
b. Diesel generator 11 or 12, and diesel generator 13 when the HPCS system is required to be OPERABLE. with each diesel generator having:
1. A day tank containing a minimum of 220 gallons of fuel.
2. A fuel storage system containing a minimum of:

0 P."oo c?.i a)"57 2% 5 gallons of fuel for each OPERABLE diesel generator 11 l

or 12.

Q" M "Q b) b397004 gallons of fuel for diesel generator 13.  !

3. A fuel transfer pump.

APPLICABILITY: OPERATIONAL CONDITIONS 4,'S and *.

ACTION:

a. With all offsite circuits inoperable nd/or with diesel generators 11 and 12 inoperable, suspend CORE ALTERATIONS, handling of irradiated fuel in the primary or secondary containment, operations with a potential for draining the reactor vessel and crane operations over the spent fuel storage pool and the upper containment pool when fuel assemblies are stored therein. In addition, when in OPERATIONAL CONDITION 5 with the water level less than 22 feet 8 inches above the reactor pressure vessel flange, immediately initiate corrective action to restore the required power sources to OPERABLE status as soon as practical.
b. With diesel generator 13 inoperable, restore the inoperable diesel generator 13 to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or declare the HPCS system inoperable and take the ACTION required by Specification 3.5.2 and 3.5.3. '
c. The provisions of Specification 3.0.3 are not applicable.

SURVEILLANCE REQUIREMENTS 4.8.1.2 At least the above required A.C. electrical power source shall be demonstrated OPERABLE per Surveillance Requirements 4.8.1.1 1, 4.8.1.1.2 and

4. 8.1.1. 3, except for the requi rement o f 4. 8.1.1.2. a. 5.

l "When handling irradiated fuel in the primary or secondary containment.

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I GRAND GULF-UNIT 1 3/4 8-9 Mendment No. S l gue -

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