05000244/LER-1987-001, :on 870220,low Fuel Oil Condition to Day Tank B Occurred Due to Offsite Power Supply Scheduled Maint.Caused by Partial Plugging of Suction Strainers.Tanks Drained & Inspected

:on 870220,low Fuel Oil Condition to Day Tank B Occurred Due to Offsite Power Supply Scheduled Maint.Caused by Partial Plugging of Suction Strainers.Tanks Drained & Inspected

ML20205C683
Person / Time
Site:	Ginna
Issue date:	03/23/1987
From:	Backus W, Kober R ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CON-IIT05-215-90, CON-IIT5-215-90 LER-87-001, LER-87-1, NUDOCS 8703300237
Download: ML20205C683 (18)

LER-1987-001, on 870220,low Fuel Oil Condition to Day Tank B Occurred Due to Offsite Power Supply Scheduled Maint.Caused by Partial Plugging of Suction Strainers.Tanks Drained & Inspected

Event date:
Report date:
2441987001R00 - NRC Website

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PAGE (31 R.E. Ginna Nuclear Power Plant 0 l5 l 010 l 0121414 1lOFl1l7 Potential Loss of Residual Heat Renoval Capability Due To Loss of Normal Fuel Oil Makeup Capability to the EDGs While Offsite Power was Secured for Maintenance EVENT DATE (5)

LER NuesgER tel REPORT DATE (7)

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NAME TELEPHONE NUMSER AREA CODE W.H. Backus, Technical Assistant to the Operations nunager 31115 51214 l-l414 I4l6 CoasPLETE ONE LINE FOR EACH COedPONENT FAILURE DESCRISED IN TMiG REPORT (13)

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AseTR ACT m,,,,,

,,.n nn.,, n ei On February 20, 1987 at 1158 EST, the unit was in cold shutdown with all station electrical power being supplied by the "A"

and "B"

Emergency Diesel Generators (EDGs) due to offsite power supply scheduled maintenance.

At this time a low fuel oil condition to the "B" EDG day tank occurred.

Within approximately 30 minutes the samL condition occurred on the "A"

EDG.

Actions were immediately taken to provide fuel to the EDGs from other sources and both EDGs continued to operate normally through-out tne event.

The cause of the event was the partial plugging of the suction strainers to the EDGs fuel oil transfer pumps.

Corrective actions taken or planned to prevent recurrence are discussed in~ detail in the body of the text in Section V, "Correc-tive Actions".

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I.

PRE-EVENT PLANT CONDITIONS j

The unit was in the cold shutdown condition for the Annual Refueling and Maintenance Outage.

The major activity in progress was the #12A transformer maintenance outage.

All offsite power was secured to the station and all station AC electrical power was being supplied by the "A" and "B"

Emergency Diesel Generators (EDGs).

The EDGs had been in service approximately 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

Reactor core decay heat removal was via the Residual Heat Removal (RHR) system with the Reactor Coolant System (RCS) 0 temperature and pressure at 90 F and atmospheric, respec-tively.

Reactor vessel water level was at approximately the loop centerline with nozzle dans installed in both Steam Generators (S/G) hot and cold legs.

The nozzle dam seals were depressurized at this time.

S/G tube plugging and sleeving was in progress.

p Prior to transferring all station AC electrical loads from I

offsite power to the EDGs, the following actions were i

taken to ensure reliability of the onsite power sources:

o The Annual Maintenance on the EDGs had been completed.

o Both EDGs fuel oil storage tanks had been emptied, cleaned, inspected and refilled with sampled fuel oil, o

Both EDGs pre-start alignments (T-27.1 and T-27.2) were completed.

o Tne Annual Surveillance Test R55P-2.3 (Emergency Diesel Generator Trip Testing) was completed on both EDGs.

o Both EDGs monthly surveillance tests (PT-12.1 and PT-12.2) were completed.

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II.

DESCRIPTIQN OF EVENT A.

EVENT On February 20, 1987 at 1158 EST, the control Room received annunciator alarm J-32 (Emergency Diesel Generator 1B Panel).

The Control Room operator called the Auxiliary Operator (AO) assigned to the EDGs and instructed him to check the "B"

EDG room for trouble.

When the AO entered the "B" EDG room, he checked the local alarm panel and observed a low fuel level alarm light.

The AO immediately checked the "B"

EDG fuel oil day tank level and observed that it was low.

Following this, he checked the fuel oil transfer pump for proper line-up and confirmed that it was correct.

About this time another AO arrived and rechecked the fuel oil makeup system status.

He then informed the Control Room of his findings (i.e., the oil level in the "B"

EDG day tank was low with the transfer pump running and all valves lined up correctly).

l B.

INOPERABLE STRUCTURES, COMPONENTS OR SYSTEMS THAT CONTRIBUTED TO THE EVENT:

o Offsite power was secured due to the #12A transformer scheduled maintenance.

o Both Steam Generators were unavailable as a heat

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en +i'ha inspection and repair.

I C.

DATES AND APPROXIMATE TIMES FOR MAJOR OCCURRENCES:

o February 20, 1987, 1158 EST:

Event date and

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discovery date.

o February 20, 1987, 1230 EST:

"A" EDG exhibited same problem as "B" EDG, low fuel oil in the day tank.

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February 20, 1987, 1235 EST:

Both EDG day tank levels are increasing to normal levels through the use of onsite portable fuel supplies.

o February 20, 1987, 1330 EST:

Plant Operating Review Committee (PORC) meeting was convened to discuss immediate corrective actions and contin-gencies for use of other power supplies.

o February 20, 1987, 1350 EST:

A full 1,000 gallon fuel oil truck arrived onsite for addi-tional makeup capability to the EDGs.

Subsequent to this an additional 12,000 gallon supply arrived on site.

o February 21, 1987, 0100 EST:

Offsite power is restored to the station.

D.

OTHER SYSTEMS OR SECONDARY FUNCTIONS AFFECTED

None.

E.

METMOD OF DISCOVERY:

The avant was immediately apparent due to an alarm in the Centrol Room and an alarm and indication in the i

"B" EDG Room.

l F.

OPERATOR ACTION

l The Control Room Operators, after notification of the low fuel oil level condition without aderplata makeup l

on the "B"

EDG, immediately informed Operations Supervision of these facts.

They then proceeded to transfer as many loads as possible from the "B"

EDG to the "A" EDG and shed some non-essential loads to reduce fuel consumption on the "B" EDG.

i Operations Supervision notified the plant staff of I

the "B"

EDG fuel oil problem and personnel were immediately dispatched to address the problem.

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With the station emergency procedures as a guide, the Control Room operators, with the help of the Shift Supervisor and the Operations Supervisor proposed the following methods for alternate decay heat removal if all AC power was lost to the station:

o Back-flooding the RCS from the Refueling Water Storage Tank (RWST) with relief through a pressurizer power operated relief valve, the S/G nozzle dam seals and the open Reactor Coolant Pump (RCP) seals.

o Back-feeding the Technical Support Center - (TSC)

EDG to 480 volt Bus #16 per procedure-ER-ELEC.4.

1 Restoring #12A transformer and offsite power to o

the station.

This was projected to take at

+

least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> because of the maintenance being performed on the #12A transformer.

Meanwhile, other operations and maintenance personnel were addressing the fuel oil problem with the "B"

EDG.

Using ER-D/G.1 (Restoring D/Gs) as a guide the "A" EDG fuel oil transfer pump discharge was crosstied to the "B"

EDG fuel oil transfer pump discharge in an effort to increase the "B" EDG fuel oil day tank level.

This did not improve the "B" EDG fuel oil day tank level problem and at approximately 1230 hours0.0142 days <br />0.342 hours <br />0.00203 weeks <br />4.68015e-4 months <br /> the "A"

EDG started to exhibit the same problem with fuel oil day tank level as the "B" EDG was experien-cing.

At about this time an onsite portable fuel tank was placed near the outside doors of the EDGs rooms and fuel oil was pumped into the fuel oil day tanks of both EDGs to restore level.

Also at about this same time a portable pump was installed to

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. transfer fuel oil from the EDGs fuel oil storage tanks to the EDGs day tanks.

This method was secured after the levels had been restored in the EDGs fuel oil day tanks because of the concern of potential contamination-from the fuel oil storage tanks.

Approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> after the start of the event, a 1,000 gallon fuel oil truck arrived on site for additional makeup capability to the EDGs.

This fuel had been ordered immediately after the beginning of the event.

Unanticipated problems encountered in the maintenance delayed restoration of offsite power to approximately 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> the next morning.

G.

SAFETY SYSTEM RESPONSES:

The EDGs continued to provide all required station AC power.

III.

CAUSE OF EVENT

A.

IMMEDIATE CAUSE:

Inadequate fuel oil makeup capability to the EDGs due to partially plugged fuel oil transfer pumps suction strainers resulting in low level in the EDGs day tanks.

B.

ROOT CAUSE:

It was determined that a group of " root causes" l

contributed to the event.

These are as follows:

o Foreign material in the EDGs fuel oil system.

This material was analyzed to be weld flux and a form of fiberous material.

The weld flux is assumed to have come from initial construction and the fiberous material from residue from either cleaning rags or filter material.

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Design of the EDGs fuel oil transfer pump suction strainers.

o Maintenance of the EDGs fuel oil transfer system suction strainers over the years of operation.

IV.

ANALYSIS OF EVENT

This event is reportable in accordance with 10 CFR 50.73, Licensee Event Report System, Item (a) (2) (v) (B), which requires reporting of "any event or condition that alone could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat" in that if the event had not been mitigated, normal residual heat removal could have been lost.

An assessment was performed of the safety consequences and implications of the event with the following results and conclusions:

A.

The #12A Transformer maintenance was in progress during the outage after consideration was given to the following facts:

o All annual maintenance and tests had been performad on both EDGa o

The reliability of the EDGs had been proven over the years of operation.

The 1986 "EPRI Data Base on EDG Reliability" define the EDG reliability for Ginna Station as 0.991.

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o Each EDG powers a safety function train and even with a single failure or loss of one complete train, the other train is fully capable of performing all safety functions necessary for residual heat removal.

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assemblies with new assemblies.

Because both EDGs continued to operate as designed throughout the event, only the safety implications will be addressed as there were no safety consequences from the event.

The following contingency actions were reviewed for possible implementation in the event a complete loss of normal Residual Heat Removal i

occurred due to a loss of onsite power:

A.

Residual heat removal via back-flooding the RCS from the RWST with water relief through the Steam Generator nozzle dam seals, the Reactor Coolant Pump seals (they were open at the time) and the pressurizer power operated relief valves.

B.

Declaration of a Site Emergency per SC-100 (Ginna Station Event Evaluation and Classifica-tion) due to "undervoltage on Bus 12A and 12B with failure to start of 1A and 1B EDGs lasting more than 15 minutes".

This declaration would have activated all onsite and offsite emergency l-facilities assuring added support and expertise f

in coping with the event.

C.

Back-feeding the Technical Support Center Emergency Diesel Generator to 480 volt Bus #16 i

i per procedure ER-ELEC.1 and using, the 1B i

Reactor coolant Drain Tank Pump par ER-RHR.1 for

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decay hea't removal.

D.

Bring in Rochester Gas and Electric Corporation's i

mobile substation to provide emergency power to the station.

E.

Backfeeding the Main Generator Transformer from the Main Switchyard to provide emergency power to the station.

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e % m.w(m As actions were taken immediately to make-up fuel oil to the EDGs (within approximately 30 minutes of discovery to adding fuel oil to the EDGs Day Tanks) and both EDGs continued to operate throughout the event, there was no compromise to plant safety or the health and welfare of the general public.

V.

CORRECTIVE ACTION

A.

Action taken to return the EDGs to normal operable status:

NOTE See Attached sketch for component location.

o Both EDGs fuel oil storage tanks were drained and inspected.

No problems were found.

o Both EDGs fuel oil transfer systems were inspected with the following results:

a.

Both EDGs fuel oil transfer pump suction strainers were found partially plugged.

b.

Both EDGs fuel oil transfer pump suction strainers were cleaned and the transfer systems lined up to recirculate back to the storage tanks.

c.

Both EDGs fuel oil transfer pump suction strainers were again found partially plugged.

d.

The suction piping of both EDGs fuel oil transfer pumps was flushed and cleaned.

Some contaminants were found.

e.

Both EDGs fuel oil transfer systems were again lined up to recirculate back to the storage tanks.

This mode of operation was continued with the periodic cleaning of suction strainers until no further contam-inents were found on the suction strainers.

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Flow and pressure tests were run on both EDGs fuel oil transfer systems and normal operating parameters were obtained.

These readings and their normal operating ranges were then added to the monthly periodic test for the EDGs so that the condition of the fuel oil transfer system will be verified each month.

4 It should be noted that the above corrective action was not commenced until all offsite power was restored to the station.

Also, while trouble shooting and corrective maintenance were in progress, both EDGs were maintained available to start and accept full load at any time.

i B.

Actions taken or planned to prevent recurrence and ensure continuous reliable offsite power supplies:

A Plant Operations Review Committee was held the day i

following the event with the committee Chairman establishing the following task forces to address action to prevent recurrence and ensure reliable offsite power supplies:

i o

Offsite Power Availability:

l a.

A short term corrective action plan has been developed and is being implemented under Engineering Work Request 4525 to use the existing 12B transformer as a back-up offsite power source.

Ginna Station procedures will be developed to control the implementation of this short-term source under emergency conditions by April, 1987.

This procedure would not

.be used at power, but is developed to provide decay heat removal capability following a reactor shutdown.

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An intermediate plan is also being developed which will utilize a spare power transformer as a means of providing offsite power while 12A and/or 12B transformers are out of service for inspection or maintenance.

This plan, including an implementation procedure, should be completed by September, 1987.

c.

Long term plans are to reconfigure the offsite system to improve the offsite power availability.

These proposed changes are currently planned for the 1989 Refueling Outage.

o Fuel Oil Transfer System R' liability:

e a.

Short term corrective actions are as follows:

1.

Fabricate and install new suction strainers consistent with pump manufac-tures requirements for the fuel oil transfer pumps.

This iter is complete.

2.

Revise the fuel oil storage tank cleaning procedure to eliminate exposure to fiberous contaminants.

This item is complete.

3.

Revise the operating procedures to require inline strainer and dedicated hoses at the truck fill connection for the reliability of the fuel to the fuel oil storage tanks.

This item is complete.

l 4.

Install a screen filter at the oil fill connection on the priming tank of the fuel oil transfer pumps.

This item is complete.

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Obtain and place an extra 1,000 gallon fuel oil tank on site with hoses capable of supplying either EDG day tank.

This interim item is complete.

b.

A reliability evaluation of the fuel oil transfer system is presently in progress.

Necessary corrective actions will be implemented following completion of this evaluation.

o SC-100 (Ginna Station Event Evaluation and Classification) activation:

The main objective of this task force was to review the SC-100 procedure for its applicability to this event and identify changes to the procedure that could improve its use.

The following conclusions were reached and actions taken.

a.

The Shift Supervisor acted correctly in not declaring an Emergency Action Level (EAL) event because the EDGs continued to operate throughout the event and the condition was mitigated so rapidly that no EAL was reached.

b.

Revise SC-100 to include a general definition of the 4 EAL's under other conditions and clarify the Loss of Power Conditions.

SC-100 has been revised and is awaiting FORC approval for implementation.

c.

Revise SC-100 to add cold shutdown initiating I

conditions.

other initiating conditions are at-power emergencies that may not satisfy cold shutdown activities.

These cold shutdown initiating conditions will be l

i developed and reviewed by May 29, 1987.

I After approval they will be placed in the l

SC-100 procedure.

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Training of plant personnel in EALs will be improved to encourage the declaration of a Unusual Event.

This is still in the planning stage and is a long term action, Fuel Oil Supply / Transportation Reliability:

o The Committee reviewed the incident and planned short and the long term corrective actions, a.

The short term actions were:

1.

Samples from both EDG storage tanks and the source tank (tank 103 at the Brooks Avenue Tank Farm) were collected and analyzed.

Results indicate that all samples met the Technical Specifi-cation requirements for viscosity 0

(32.6 to 40.1 sus e 100 F) and water and sediment (1 0.05%).

2.

A review of the QA documentation on the cleanliness inspection of the EDG storage tanks and sample analysis for fuel oil delivered in the past few months indicated no anomalies.

3.

The transport company was contacted to determine which tankers had been used and what they had been used for prior to their use to deliver fuel oil to the plant prior to the event.

The transport company indicated that the f

tankers were only used for transporta-tion of petroleum based products.

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A procedure is being developed to assure clean non-contaminated fuel from the Tank Farm to EDG storage tanks.

This procedure is scheduled to be completed by April, 1987.

o Maintenance Procedure Improvements:

M-15.1 (A or B Diesel Generator Inspection and Maintenance) procedure, which is performed at least annually, was reviewed as a result of the event.

The following list of items was incorpor-ated into the procedure to improve the reliability of the fuel oil transfer system.

a.

Drain fuel transfer pump priming tank and refill.

b.

Check and clean fuel transfer pump suction filters / strainers per M-15.3 (Maintenance of 1A or 1B Diesel Fuel Oil Transfer Pump).

c.

Drain day tank to storage tank.

d.

Clean strainer inside storage tank when empty.

e.

Inspect foot valve inside storage tank.

f.

Vacuum storage tank to prevent any residual particles.

g.

Use a plant approved procedura - T-27.3

" Fuel Oil Receipt Emergency / Fire Diesel" when filling the storage tank.

h.

Run fuel transfer pump and fill day tank, verifying adequate discharge pressure.

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Diesel Testing Improvements:

EDGs test procedures were reviewed as a result of the event.

The following are the short term corrective actions and long term recommendations:

a.

Short term corrective actions:

1.

The monthly EDGs surveillance tests (PT-12.1 and PT-12.2) were revised to add new data sheets to monitor the fuel oil transfer pump suction and discharge pressures during loaded and unloaded conditions of the pump to determine the condition of the suction strainer.

2.

Providad an improved means to measure level

,I changes in the day tank so that makeup by the transfer pump can be more precisely accoured against time.

This will provide a better means to trend pump performance.

3.

Established ranges for parameters recorded on the above data sheet to provide better guidance for the operators recording the data.

4.

Trending critical parameters so that any degradation of components can be identified in a timely manner.

b.

Long term corrective actions being considered are:

1.

Upgraded instrumentation to improve monitor-ing capability.

2.

Develop a procedure to verify the auto-start capabilities of the fuel oil transfer pump on decreasing day tank level.

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IV

ADDITIONAL INFORMATION

A.

Failed Components:

There were no component failures that contributed to this event.

B.

Previous LER's on similar events:

A similar LER event historical search was conducted with the following results:

No documentation of similar LER events could be identified.

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ROCHESTER GAS AND ELECTRIC CORPORATION e 89 EAST AVENUE, ROCHESTER, N.Y. 14649-0001 - N ROGER W. KOBER TEl EPHONE VICE PRESIDENT

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March 23, 1987 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Subject:

LER 87-001, Potential Loss of Residual Heat Removal capability Due to Loss of Normal Fuel Oil Makeup Capability to the Emergency Diesel Generators (EDGs)

While offsite Power Was Secured for Maintenance R.E. Ginna Nuclear Power Plant Docket No. 50-244 In accordance with 10 CFR 50.73, Licensee Event. Report System, item (a) (2) (v) (B) which requires a report of, "any event or condition that alone could have prevented the fulfillment of the Safety Function of structures or systems that are needed to remove residual heat," the attached Licensee Event Report LER 87-001 is hereby submitted.

V Itruly yours, O f

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Roger W. Ko f

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U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Ginna USNRC Resident Inspector l

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