Information Notice 1989-50, Inadequate Emergency Diesel Generator Fuel Supply

Inadequate Emergency Diesel Generator Fuel Supply

ML031180655
Person / Time
Site:	Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant
Issue date:	05/30/1989
From:	Rossi C Office of Nuclear Reactor Regulation
To:
References
IN-89-050, NUDOCS 8905230215
Download: ML031180655 (4)

- NU A UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555

- May 30, 1989 NRC INFORMATION NOTICE NO. 89-50' INADEQUATE EMERGENCY DIESEL GENERATOR FUEL

SUPPLY

Addressees

All holders of operating licenses or construction permits for' nuclear power

reactors.

Purpose

This information notice is being provided to alert addressees to the potential

for existence of an Inadequate emergency diesel generator (EDG) fuel supply.

It is expected that recipients will review the information for applicability

to their facilities and consider actions, as appropriate, to avoid similar

problems. However, suggestions contained in this information notice .do not

constitute NRC requirements; therefore-, no specific action or written response

is required.-

Description of Circumstances

Duringia review of the 'design basis for the EDGs at Palisades, it was dis- covered that the fuel oil consumption calculations, performed in 1968, had

not been updated to reflect changes in equipment loading and operating times

in post-accident conditions. Subsequent calculations by the licensee indicated

that 23,000 gallons of diesel fuel would be required to ensure that a seven day

supply would be available to support EDG operation under the current load

requirements. This value exceeds the minimum 16,000 gallon limit specified

in the Technical Specifications (TS). The licensee's corrective actions in- cluded prescribing a higher administrative--limit of 23,000 gallons of fuel and

performing additional calculations to support a TS change request. This is

discussed further in licensee event, report (LER) 50-255/89-005.

A discrepancy between the Final Safety Analysis' Report (FSAR) and the TS basis

was identified at Robinson Unit 2. The TS basis specified that 25,000 gallons

of fuel oil be maintained for operation of one EDG carrying "minimum safety

features" load for seven days. The FSAR described the 25,000 gallons as suf- ficient for one EDG carrying "full load" for seven days.. Calculations performed

by the licensee indicate that 25,000 gallons is only marginally sufficient for

one EDG carrying 'minimum safety features" load for seven days since fuel

consumption is highly dependent on selective load shedding. The licensee's

89053021

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IN 89-50

May 30, 1989 calculations also indicate that one EDG carrying "full load" for seven days

would require approximately 30,430 gallons. The licensee's corrective actions

included redefining the basis for the seven day fuel supply to the more con- servative value (operation of the EDG at its rated capacity) and revising

the TS to reflect the increased minimum fuel inventory. This is discussed

further in NRC Inspection Report No. 50-261/87-06 and in LER 50-261/88-006.

The McGuire FSAR indicates that the underground storage tank for each EDG is

sized so that the corresponding EDG can carry the 4160 Volt Essential Auxiliary

Power Systems load for seven days. The TS require that each underground storage

tank contain a minimum volume of 28,000 gallons of fuel. Recently, it was

discovered that 28,000 gallons is not sufficient to ensure seven days of EDG

operation. The licensee has Indicated that design calculations show that appro- ximately 48,533 gallons of fuel are needed to ensure seven days of operation at

rated load. This is discussed further in NRC Inspection Report No. 50-369/89-02.

Discussion:

Regulatory Guide 1.137, "Fuel Oil Systems for Standby Diesel Generators,"

contains guidance for calculation of EDG fuel oil storage requirements.

Two methods are provided: 1) calculations based on the assumption that

the EDG operates continuously for seven days at its rated capacity and

2) calculations based on the time-dependent loads of the EDG (which should

include the capacity to power the engineered safety features).

No specific action or written response is required by this information notice.

If you have any questions about this matter, please contact the technical

contact listed below or the Regional Administrator of the appropriate regional

office.

Charles E. Rossi, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Jack Ramsey, NRR

(301) 492-1167 Attachment: List of Recently Issued NRC Information Notices

• SEE PREVIOUS CONCURRENCES

05)2389

• OGCB:DOEA:NRR *RII *SAD/DEST:NRR *RPB:ARM *C/OGCB:DOEA:NRR

JERamsey PKellogg AThadani TechEd CHBerlinger

05/10/89 05/09/89 05/15/89 05/08/89 05/22/89

IN 89-XX

May xx, 1989 licensee's calculations also indicate that one EDG carrying "full load" for

seven days would require approximately 30,430 gallons. The licensee's cor- rective actions Included redefining the basis for the seven day fuel supply to

the more conservative value (operation of the EDG at its rated capacity), and

revising the TS to reflect the increased minimum fuel inventory and the basis

for the seven day fuel supply. This is discussed further in NRC Inspection

Report No. 50-261/87-06 and in LER 50-261/88-006.

The McGuire FSAR indicates that the underground storage tank for each EDG is

sized so that the corresponding EDG can carry the 4160 Volt Essential Auxiliary

Power Systems loads for seven days. The TS require that each underground

storage tank contain a minimum volume of 28,000 gallons of fuel. Recently, it

was discovered that 28,000 gallons is not sufficient to ensure seven days of

EDG operation. The licensee has indicated that design calculations show that

approximately 48,533 gallons of fuel are needed to ensure seven days of opera- tion at rated load. This is discussed further in NRC Inspection Report No.

50-369/89-02.

Discussion:

NRC regulations require that an onsite electric power system and an offsite

electric power system be provided to permit functioning of structures, systems, and components important to safety. Methods acceptable to the NRC staff for

complying with the NRC's regulations regarding EDG fuel oil systems are de- scribed in Regulatory Guide 1.137. Regulatory Guide 1.137 indicates that the

two methods acceptable to the NRC staff for calculation of fuel oil storage

requirements are 1) calculations based on the assumption that the EDG operates

continuously for seven days at its rated capacity and 2) calculations based on

the time-dependent loads of the EDG (which should include the capacity to power

the engineered safety features). It is important for addressees to determine

the existence of an adequate emergency diesel generator fuel supply.

No specific action or written response is required by this information notice.

If you have any questions about this matter, please contact the technical

contact listed below or the Regional Administrator of the appropriate regional

office.

Charles E. Rossi, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Jack Ramsey, NRR

(301) 492-1167 Attachment: List of Recently Issued NRC Information Notices

• SEE PREVIOUS CONCURRENCES D/DOEA:NRR

CERossi

05/ /89 iia

• OGCB:DOEA:NRR *RII *SAD/DEST:NRR *RPB:ARM C/OGCB:DOO.MRR'

JERamsey PKellogg AThadani TechEd CHBerlinger

05/10/89 05/09/89 05/15/89 05/08/89 05/,%V89

IN 89-XX

May xx, 1989 EDG carrying "full load" for seven days would require approximately 30,430

gallons. This is discussed further in NRC Inspection Report No. 50-261/87-06 and in LER 50-261/88-006.

The McGuire FSAR indicates that the underground storage tank for each EDG is

sized so that the corresponding EDG can carry the 4160 Volt Essential Auxiliary

Power Systems loads for seven days. The TS require that each underground

storage tank contain a minimum volume of 28,000 gallons of fuel. Recently, it

was discovered that 28,000 gallons is not sufficient to ensure seven days of

EDG operation. The licensee has indicated that design calculations show that

approximately 48,533 gallons of fuel are needed to ensure seven days of opera- tion at rated load. This is discussed further in NRC Inspection Report No.

50-369/89-02.

Discussion:

NRC regulations require that an onsite electric power system and an offsite

electric power system be provided to permit functioning of structures, systems, and components important to safety. Methods acceptable to the NRC staff for

complying with the NRC's regulations regarding EDG fuel oil systems are de- scribed in Regulatory Guide 1.137. Regulatory Guide 1.137 indicates that the

two methods acceptable to the NRC staff for calculation of fuel oil storage

requirements are 1) calculations based on the assumption that the EDG operates

continuously for seven days at Its rated capacity and 2) calculations based on

the time-dependent loads of the EDG (which should include the capacity to power

the engineered safety features). The occurrence of the events described above

Indicates that an inadequate EDG fuel supply may exist at other facilities.

No specific action or written response is required by this information notice.

If you have any questions about this matter, please contact the technical

contact listed below or the Regional Administrator of the appropriate regional

office.

Charles E. Rossi, Director

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Jack Ramsey, NRR

(301) 492-1167 Attachment: List of Recently Issued NRC Information Notices

D/DOEA:NRR

CERossi

M 05/ /89 DOEA:NRR R11 SAD/DEST:NRR RPB:ARM C/OGCB:DOEA:NRR

'Eamsey PKellogg ATha ani TechEd CHBerlinger

05/1a/89 05/" /89 05/15!89 05/r/89 05/ /89 k 5 &94a,

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