ML20134H485

From kanterella
Jump to navigation Jump to search
Insp Repts 50-324/85-22 & 50-325/85-22 on 850701-31. Violation Noted:Inadequate Corrective Action Re Annunciator Procedures & Hydraulic Control Units Not Installed Per Drawing
ML20134H485
Person / Time
Site: Brunswick  Duke Energy icon.png
Issue date: 08/12/1985
From: Fredrickson P, Garner L, Hicks T, Paulk G, Puland W, Ruland W
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
Shared Package
ML20134H476 List:
References
50-324-85-22, 50-325-85-22, NUDOCS 8508280435
Download: ML20134H485 (12)


See also: IR 05000324/1985022

Text

-

,

.

'

p [t?

UNITED STATES

o

NUCLEAR REGULATORY COMMISSION

g"

-

o

REGloN 11

g

j

101 MARIETTA STREET,N.W.

I e

ATLANTA, GEORGIA 30323

\\...../

Report Nos. 50-325/85-22 and 50-324/85-22

Licensee: Carolina Power and Light Company

P. O. Box 1551

Raleigh, NC 27602

Docket Nos. 50-325 and 50-324

License Nos. OPR-71 and DPR-62

Facility Name:

Brunswick 1 and 2

Inspection Conducted: July 1 - 31, 1985

Inspectors:

O M /-8[

W.

. Rula dS

Date Signed

)h n(1

12. Av6 85

G. L.'_PauT'

_W '

Date Signed

.L2AG&95

L.'W. Garner

'" '

Date Signed

_] AU S OS

1

l

W .

E.' Hicks

Date Signed

T

'

Approved By:

11. /f ()(r- j[

bg

P. E. Fredrichs6ff,' Section Chief

Date Signed

Division of Reactor Projects

SUMMARY

Scope:

This routine safety inspection involved 237 inspector-hours on site in

the areas of followup on previous enforcement matters, maintenance observation,

surveillance observation,

operational

safety verification, onsite review

committee, onsite Licensee Event Reports review, plant modifications, and

inadvertent core spray initiation.

Results:

Two violations were identified: Inadequate Corrective Action Relating

,

To Annunciator Procedures and Hydraulic Control Units (HCU's) Not Installed As

Per Drawing; two unresolved items, Drywell Temperature Calculation and Unusual

Event Due to Fuel Pc31 Overflow.

F508280435 850813

PDR

ADOCK 05000324

O

PDR

_ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

_ _ _

_ . _ _ _ _ _ _ _ _ _ .

. _ .

__

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

_

. _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _

.

SUMMARY DETAILS

1.

Persons Contacted

Licensee Employees

P. Howe, Vice President - Brunswick Nuclear Project

C. Dietz, General Manager - Brunswick Nuclear Project

T. Wyllie, Manager - Engineering and Construction

G. Oliver, Manager - Site Planning and Control

J. Holder, Manager - Outages

E. Bishop, Assistant to General Manager

'L. Jones, Director - QA/QC

M. Shealy, Acting Director - Training

M. Jones, Acting Director - Onsite Nuclear Safety - BSEP

J. Chase, Manager - Operations

J. O'Sullivan, Manager - Maintenance

G. Cheatham, Manager - Environmental & Radiation Control

K. Enzor, Director - Regulatory Compliance

B. Hinkley, Manager - Technical Support

L. Boyer, Director - Administrative Support

V. Wagoner, Director - IPBS/Long Range Planning

C. Blackmon, Superintendent - Operations

J. Wilcox, Principle Engineer - Operations

W. Hogle, Engineering Supervisor

W. Tucker, Eagineering Supervisor

B. Wilson, Engineering Supervisor

R. Creech, I&C/ Electrical Maintenance Supervisor (Unit 2)

J Moyer, I&C/ Electrical Maintenance Supervisor (Unit 1)

R. Kitchen, Mechanical Maintenance Supervisor (Unit 2)

R. Poulk, Senior NRC Regulatory Specialist

D. Novotny, Senior Regulatory Specialist

W. Dorman, QA - Supervisor

W. Hatcher, Security Supervisor

W. Murray, Senior Engineer - Nuclear Licensing Unit

Other licensee employees contacted included construction craftsmen,

engineers, technicians, operators, office personnel, and security force

memoers.

NRC Resident Inspector

G. Paulk, Senior Resident Inspector, Brown's Ferry

2.

Exit Interview (30703)

The inspection scope and findings were summarized on August 7,

1985, with

the general manager.

Two violations, described in paragraph six, were

discussed in detail.

The licensee acknowledged the findings without

_a

____ _ ______ __ _

_.

_

_

._ __.

'

.

2

exceptinn.

The licensee did not identify as proprietary any of the

materials provided to or reviewed by the inspectors during the inspection.

3.

Followup on Previous Enforcement Matters (92702)

(CLOSED) Violation 325, 324/85-03-02: Inadequate Procedure, Operating

Procedure (0P) 6.12, Condensate Phase Separator Operating Procedure.

'

The inspector verified that:

(1) ops 6.12, 6.13, 6.14, 6.15 and 6.16 were

changed to include cautions to direct operating personnel to close loading

dock isolation valves from the radwaste control room upon indication of

unusual circumstances or conditions; (2) PT-45.1, Loading Dock Transfer

Lines Leak Test, was revised to incorporate necessary precautions to

preclude line freeing; (3) Radwaste operating personnel were trained on the

procedural changes and this event.

Also, the radwaste loading dock was

illuminated and the flex hose drained when not in use.

No violations or deviations were identified.

4.

Maintenance Observation (62703)

The inspectors observed maintenance activities and reviewed records to

verify that work was conducted in accordance with approved procedures,

Technical Specifications, and applicable industry codes and standards. The

inspectors also verified that:

redundant components were operable;

administrative controls were followed; tagouts were adequate; personnel were

qualified; correct replacement parts were used; radiological controls were

proper; fire protection was adequate; QC hold points were adequate and

observed; adequate post-maintenance testing was performed; and independent

verification requirements were implemented.

The inspectors independently

verified that selected equipment was properly returned to service.

Outstanding work requests and authorizations (WR&A) were reviewed to ensure

that the licensee gave priority to safety-related maintenance.

The inspectors observed / reviewed portions of the following maintenance

activities:

WR&A 1-M-85-2431, SGTS ( for PT-15.1.2)

MI-16-528, Fisher Butterfly Valves

PM-84-195, N2 Backup System

PM-84-299, Service Water Phase II Inspect / Repair / Replacement

No violations or deviations were identified.

'

.

3

5.

Surveillance Observation (61726)

The inspectors observed surveillance testing required by Technical

Specifications.

Through observation and record review, the inspectors

verified that:

tests conformed to Technical Specification requirements;

administrative controls were followed; personnel were qualified; instru-

mentation was calibrated; and data was accurate and complete.

The

inspectors independently verified selected test results and proper return to

service of equipment.

The inspectors witnessed / reviewed portions of the following test activities:

2MST-RHR21M, Rev. 0

-

- PT 16.2-2, Primary Containment Volumetric Average Temperature

- Daily Surveillance Requirements

a.

Primary Containment Average Air Temperature Determination

The licensee has not yet found any record which supports the use of

certain coefficients used to calculate primary containment average

temperature. Technical Specification 4.6.1.6 requires the licensee to

determine primary containment volumetric average air temperature at

least every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. PT-16.2-2 implements T.S. 4.6.1.6.

Thermocouple

readings between certain elevations are averaged and multiplied by a

volumetric coefficient for the specific containment volume monitored.

Values from five volumes are added together to obtain the volumetric

average temperature. The licensee has been unable to produce records

to support the values used for the volumetric coefficients in

PT-16.2-2.

The licensee continues to interview current and former

employees and search records for supporting information for the

coefficients. Until the licensee can support the calculations and the

coefficients used in PT-16.2-2, this item is Unresolved:

Drywell

Temperature Volumetric Ccafficients, (325, 324/85-22-03).

b.

Daily Surveillance Requirements Review

During a tour on July 1,1985, the inspector noted that the 1600-2400

hours shift foreman failed to review and initial the Daily Surveillance

Requirements (DSR) log for June 30, 1985.

On July 17, 1985, the

inspector noted that the steam jet air ejector radiation monitor

readings (012-RM-K601A and B) were not taken between 2200-2400 hours

on July 16,1985. The reactor operator also failed to initial the page.

These omissions were discussed with the shift operations supervisor and

plant management, the identified omissions were corrected.

No violations or deviations were identified.

.

l

L_

,

.

4

6.

Operational Safety Verification (71707 and 71710)

The inspectors verified conformance with regulatory requirements by direct

observations of activities, facility tours, discussions with personnel,

reviewing of records and independent verification of safety system status.

The inspectors verified that control room manning requirements of 10 CFR 50.54 and the Technical Specifications were met.

Control room, shift

supervisor, clearance and jumper / bypass logs were reviewed to obtain

information concerning operating trends and out of service safety systems to

ensure that there were no conflicts with Technical Specifications Limiting

Conditions for Operations.

Direct observations were conducted of control

room panels, instrumentation and recorder traces important to safety to

verify operability and that parameters were within Technical Specification

limits. The inspectors observed shift turnovers to verify that continuity

of system status was maintained.

The inspectors verified the status of

selected control room annunciators.

Operability of a selected ESF train was verified by insuring that:

each

accessible valve in the flow path was in its correct position; each power

supply and breaker, including control room fuses, were aligned for

components that must activate upon initiation signal; removal of power from

those ESF motor-operated valves, so identified by Technical Specifications,

was completed; there was no leakage of major components; there was proper

lubrication and cooling water available; and a condition did not exist which

might prevent fulfillment of the system's functional

requirements.

Instrumentation essential to system actuation or performance was verified

operable by observing on-scale indication and proper instrument valve

lineup, if accessible.

The inspectors verified that the licensee's health physics policies /proce-

dures were followed. This included a review of area surveys, radiation work

permits, posting, and instrument calibration.

The inspectors verified that: the security organization was properly manned

and that security personnel were capable of performing their assigned

functions; persons and packages were checked prior to entry into the

protected area (PA); vehicles were properly authorized, searched and

escorted within the PA; persons within the PA displayed photo identification

badges; personnel in vital areas were authorized; effective compensatory

measures were employed when required; and security's response to threats or

alarms was adequate.

The inspectors also observed plant housekeeping controls, verified position

of certain containment isolation valves, checked a clearance, and verified

the operability of onsite and offsite emergency power sources.

-

- _____ - _ - _ _ _ - _ _ - .

_ _ _ _ _

_'

[:

-

,

!

l1

5

l-

,

a.

Inadequate Annunciator Procedures.

During a review-of the Plant Operating Manual Annunciator Procedures

(APs), a generic deficiency was identified.

Contained in the action

statements for many of - the procedures are references to Emergency

!

l

Instructions (EIs) which were designed to provide the operator with

followup actions and recovery steps.

However the Els had been

completely replaced over one year earlier (approximately May 1984) with

either Emergency Operating Procedures (E0P's) or Abnormal Operating

,

Procedures (A0Ps) depending on the emergency. The licensee's plan was

t

,

to update the APs sometime thereafter. In the interim period, a cross

'

reference was generated and provided to the operators in the control

room.

The cross reference would be used until the APs could be

revised.

However, this document had not been incorporated into~ an

approved procedure and was inadvertently removed from the control room.

If one of the annunciator procedures in question was then used, the

operator would have to identify the referenced EI with a new procedure

.by reviewing the A0P, E0P procedure index and determining which 'new

procedure was applicable. Since the titles of the new procedures did

not necessarily match the old procedure titles, this type of evolution

l.

could be time consuming and allow for errors.

.

l

Consequently this program failed to be adequately implemented in that

most of the procedures reviewed, which required changes, were not yet

updated nor did the operators have a readily available means to

icross-reference the old EI's with the new E0P's and AOP's.

l

Examples of this problem are as follows:

Annunciator

Action Statement

Annunciator Panel

Description

Reference

A-03; 1-7

RHR System II Actuator

EI-1.2 Rupture

Inside Drywell,

EI-08 Abnormal

Reactor Water Level,

EI-5.2 Loss of

Primary Containment

l

l

A-03; 3-4

Reactor Core Isolation

EI-07 Reactor Core

l

Cooling Pump Discharge

Isolation Cooling

l

Flow Low

System Failure

A-05;.3-5

Reactor Vessel Pressure

EI-4.1 MSIV Closure,

High

EI-31 Reactor Scram

l

l

UA-03; 6-1

High Activity Process Off

EI-26 Of f Gas High

i

Gas Vent Pipe

Radiation, EI-27.3

Abnormal Release of

Radioactivity

Airborne

f

-

_ _ , _ _ - . . - , -

.

i

.

6

UA-03; 6-6

Area Radiation Stack

EI-23.4 High

Filter House High

Radiation in

Accessible Areas

UA-04; 1-4

Reactor Feed Pump

EI-09 Condensate

Turbine Tripped

and Feedwater System

Failure

A-06; 4-6

Steam Tunnel High Temp

EI-31 Reactor

System B

Scram, EI-20 Main

Steam Line Leaks

VA-15; 2-1

El Bus Undervoltage

EI-15.1 Station

Blackout Operation,

EI-15.2 Degraded

Auxiliary Electrical

Power Operation

10 CFR 50 Appendix B, Criterion XVI, as implemented by FSAR Section

17.2.16, Corrective Action, requires measures be established to assure

that conditions adverse to quality (i.e. , deficiencies) are promptly

identified and corrected.

Technical Specification 6.8.1.c requires

that the licensee maintain and implement procedures specified in Reg.

Guide 1.33, November 1972.

Item

"E"

of the guide requires that

procedures for correcting abnormal, offnormal or alarm condition be

implemented.

Contrary to the above, a condition adverse to quality was not

adequately corrected in that most annunciator procedures which required

changes, caused by the introduction of Emergency Operating and Abnormal

Operating Procedures and the elimination of the Emergency Instructions,

were not updated and corrected or an alternate means adequately

provided

to

clarify reference discrepancies contained in the

procedures. This is a violation, inadequate corrective action relating

to annunciator procedures (325, 324/85-22-01) of NRC requirements. The

licensee has since provided the operators with a readily accessible

cross-reference list while the annunciator procedures are changed.

Also, ANSI 18.7, 1976, Administrative Controls and Quality Assurance

for the Operational Phase of Nuclear Power Plants, Section 5.2.15,

Review, Approval and Control of Procedures, requires that plant

procedures be reviewed no less frequently than every two years to

determine if changes are necessary or desirable.

The licensee's

Administrative Procedures, Volume I Book I, Section 5.6,

implements

this ANSI requirement and specifies that the reviewer " Attest that the

procedure remains accurate, effective, and useful for its intended

purpose; or otherwise, revisions are initiated to correct identified

deficiencies." The licensee is committed to comply with ANSI 18.7,

1976.

_ _ _ - _ .

_ _ .

-

. _ _

_ _ _ _ _ _ _

__

_ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

,

7

The licensee did conduct a review (completed in April 1985), as

required, but failed to make any procedure changes as a result of it.

One reviewer did identify several deficiencies in three of the

annunciator panels and submitted 01-28, Preparation and Review of

Operating Procedures, changes. At the time of the inspection, none of

the changes had been implemented.

b.

Hydraulic Control Unit Problems

A routine inspection of the Control Rod Drive (CRD) Hydraulic Control

Units for Unit 2,

revealed the following items, which were not in

accordance with plant design drawing G. E. 9190615:

1)

HCU racks Nos. 18-51, 14-19, 02-27 and 06-31 had support to

foundation bolts and/or nuts disengaged.

2)

HCU rack No. 30-43 had 2 of the 4 rack support to foundation bolts

missing.

3)

All bolts, lockwashers and washers on the HCU rack supports did

not appear to be cadmium plated as required.

4)

HCU rack No. 18-35 support to foundation bolt had what appeared to

be a welding ground pigtail attached under it.

In addition caps were missing from directional control valves on HCU's

Nos. 18-07, 34-31, 18-31 and 42-11.

The area also exhibited poor

housekeeping in that miscellaneous materials were in, on or between the

HCU racks.

These items included:

parts of valves, a lead brick, a

stainless steel bar, rusty washers, nuts and bolts, rolls of duct tape

and trash.

Items 1) and 2) constitute a violation of 10 CFR 50 Appendix B,

Criterion V (325, 324/85-22-02), hydraulic control units not installed

per drawings.

Subsequent inspections by the licensee revealed similar

discrepancies on Unit 1.

.

c.

Diesel Generator Walkdown

During a detailed walkdown on Diesel Generator No.

1,

prior to

post-maintenance testing, the inspector found four valves which had no

tags on them and were not contained in the Operating

Procedure OP-39

valve check list. Two of these were valves associated with calibration

of the pressure switch which provides for actuation of the shutdown

cylinder to close the fuel racks during engine shutdown. These three

valves are addressed in the appropriate maintenance procedures.

A

similar condition existed on the other three diesel generators.

The

remaining valve was installed in parallel with an air regulator valve

in the starting circuit.

The other diesel generators have a check

valve in this application as shown in the technical manual.

The

licensee is evaluating this "as found" condition.

The licensee has

,, . . - - . _ _ -

. _ _ _ _

. - . .

. _ , _ _ _ _ .

- -

- - _ . - - . . _-

..

___ _

. - _ _ _ _ _ _ _ _ _ _ _ _ _ _

_

__

. _ _ _ _ _ .

_ _ _ _

_

_

_ _ _ _ _ _ _ _

_

_ _ _ _ _ _ _ _ _

.

8

indicated that OP-39 will be revised to include these valves as

appropriate. This is an Inspector Followup Item: OP-39 Revision (325,

324/85-22-04).

d. Hurricane Bob

On July 24, 1985, the remnant of Hurricane Bob, downgraded to a tropical

"

storm, past approximately 100 miles inland of the Brunswick site. Only

periods of heavy rain were experienced at the site.

Plant operations were

4

unaffected. Unit I was in refuel and Unit 2 was operating near full power.

The licensee had taken preparatory action in case the hurricane did approach

the site. This included tracking of the hurricane and establishing criteria

for activation of the technical support center and shutdown of Unit 2.

Unit

2 would have begun shut down if hurricane force winds were expected at the

site within four hours. No such action was required.

7.

Onsite Review Committee (40700)

The inspectors attended selected Plant Nuclear Safety Committee meetings

conducted during the period. The inspectors verified that the meetings were

conducted in accordance with Technical Specification requirements regarding

quorum membership, review process, frequency and personnel qualifications.

Meeting minutes were reviewed to confirm that decisions / recommendations were

reflected in the minutes and followup of corrective actions was completed.

No violations or deviations were identified.

3

8.

Onsite Review of Licensee Event Reports (92700 and 90712)

'

The listed Licensee Event Reports (LERs) were reviewed to verify that

the information provided met NRC reporting requirements.

The verification

',

included adequacy of event description and corrective action taken or

planned, existence of potential generic problems and the relative safety

significance of the event. Onsite inspections were performed and concluded

!

that necessary corrective actions have been taken in accordance with

!

existing requirements, licensee conditions and commitments.

The following

reports are considered closed:

(CLOSED)

LER 1-83-01; Pipe sides of weld B32 showed pin hole cracks

attributed to IGSCC.

Future action addressed in response to IEB 82-03.

This defect was identified during 82-03 inspections.

Bulletin 82-03 was

closed for Unit 1 in IE inspection report 85-08.

(CLOSED) LER 1-83-04; Two crack indications in the heat affected zone on

the pipe side of weld downstream of the loop discharge valve. These defects

were identified during IEB 82-03 insrections.Bulletin 82-03 was closed for

,

Unit 1 in IE inspection report 85-08.

(CLOSED) LER 1-83-49; Two crack indications exist in the heat affected zone

i

on the pipe side of weld B32-RECIRC-28-A-14 and B32-RECIRC-28-B-8 due to

IGSCC.

These defects were identified during IEB 83-02 inspections.

i

t

_ _ _ - _ - _ _ _ _ _ _ _ .

__

__

__

_______

_

___

. _ . _ _ _ _ _

.

9

.d

e

Further licensee and NRC actions concerning IGSCC are addressed in Generic Letter 84-11.

(CLOSED) LER 1-85-024; Manually initiated isolation of Units 1 and 2 common

control building heating ventilating air conditioning system.

(CLOSED) LER 2-83-38; An inoperative and rod block signal was received due

to defective multiplexer cards.

(CLOSED) LER 2-83-40; Residual Heat Removal System flow transmitter had no

output response to an applied test signal.

No violations or deviations were identified.

9.

Design, Changes and Modifications (37700)

On July 1, 1985, a construction engineer working on Unit 1 suppression

chamber modifications discovered the suppression chamber spray nozzles were

not installed.

The unit was in cold shutdown undergoing a refueling outage.

The suppression chamber spray header system is a subsystem of the contain-

ment spray system, and is an operational mode of Residual Heat Removal

System (RHR). With the RHR system in containment cooling mode of operation,

the RHR pumps are aligned to pump water from the suppression pool through

the RHR system heat exchangers where cooling takes place by transferring

heat to the unit service water system. Flow returns to the suppression pool

via the full flow test line.

Under post-accident conditions, the containment cooling subsystem provides

additional redundancy to the core standby cooling systems. Approximately 5

percent of the flow from the heat exchangers may be directed to the

suppression chanber spray ring to cool any noncondensible gases collected in

the free volume above the suppression pool. Analysis shows (refer FSAR

Section 6.2.1.1.3.2.1), that containment spray is not necessary to provide

adequate containment protection during the design basis accident. There-

fore, containment spray failure was not a safety problem (refer FSAR Section

6.2.2.2).

The licensee determined that the suppression chamber spray nozzles have

never been installed.

A review of startup testing turnover packages

revealed no apparent reason for the deficiency.

New nozzles have been

ordered and will be installed prior to suppression chamber closecut and

plant startup.

This corrective action will be verified during subsequent

routine inspections.

No violations or deviations were identified,

h

.

10

10.

Core Spray Initiation and Overflow of Spent Fuel Pool (93702)

On July 30, 1985 at 2236 hours0.0259 days <br />0.621 hours <br />0.0037 weeks <br />8.50798e-4 months <br />, a spurious low vessel water level LOCA

signal initiated available ECCS systems on Unit 1.

This resulted in

over-filling of the spent fuel pool and subsequent release of approximately

25,000 gallons of water into the Reactor Building.

Safety systems which

automatically actuated included three emergency diesel generators, core

spray loop 1A and group I isolation. Other systems which would normally

have started were under clearances for either maintenance or modification.

Unit I was in an outage with the vessel defueled, fuel pool gates removed

and the vessel cavity flooded up.

Full power operations of Unit 2 were

unaf fected by the event. Description of the sequence of events, root cause

and preliminary corrective actions, damage assessment and cleanup status

follows:

6-15-85

Clearance No. 886 boundary changed to allow venting and

hydrostatic testing of instrument 1-821-LT-N026A as directed

by plant modification 82-271.

Clearance designated No. 886A.

7-01-85

Clearance tags for 1-B21-LT-N026A removed from No. 886A

to allow testing on another modification.

7-30-85

Clearance tags for 1-821-LT-N026A not rehung prior to

resuming venting of instrument.

2236 Venting of 1-821-LT-N026A causes slight depressurization of

variable instrument leg containing 1-821-LT-NO31A and C.

These latter instruments initiate a low level 2 group I

isolation signal and a low level 3 LOCA signal. The control

operator (CO) observes the group I isolation annunciator and

auto starting of diesel generators 1, 3 and 4. The shift

foreman thought radiography in the main streamline isolation

valve pit may have commenced.

A senior control operator

(SCO) went to the backpanel to check radiation monitor

status.

2237 SCO reports fire in backpanel. Fuel pool high level alarm is

received. C0 requests radwaste to maximize reject from fuel

pool.

2238 CO begins control board walkdown.

Group I is reset. Core

spray logic system failure annunciator is in alarm.

Health

physicist on refuel floor reports fuel pool level is at

ventilation ducts which surround the upper portion of the

fuel pool walls.

2239 C0 trips running CRD pump.

Core spray pump 1A is found

running and is manually tripped.

2240 Extinguishment of the backpanel fire commences.

.

_ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

__.

.

..

11

2245 Fire is reported out in the core spray logic panel. Two HFA

relays had smoked.

No flaming had occurred.

No other

components were damaged by the fire.

7-31-85

At 0903 hours0.0105 days <br />0.251 hours <br />0.00149 weeks <br />3.435915e-4 months <br />, the Licensee determined that they were in an

unusual event based upon their emergency guideline procedure.

Per the Shift Operating Supervisor judgement, it was deter-

mined that plant conditions exist that warrant increased

awareness on the part of the plant operating staff. This was

predicated on the fact that a large area of the reactor

building had become contaminated and that if the water dried

out, there was a potential for the areas to become airborne.

8-01-85

At 0830 the unusual event was terminated based upon the

progress being made by the decontamination teams.

The root cause of the event was determined to be a problem with restarting a

modification procedure after it had been interrupted.

In addition, its

effects were amplified by another problem.

Installation of the nitrogen

backup supply to the drywell modification had inadvertently installed AC

type HFA relays into the core spray system logic which is powered by DC.

Thus, when the spurious LOCA signal occurred, these relays burned up causing

loss of power to the core spray logic. With the logic de-energized, all

initiation logic lights and annunciators associated with the core spray

initiation were inoperable.

Hence, the operator was not immediately

notified of the core spray injection. Another possible annunciator, Core

Spray /RHR Pump Running, was already lit since the RHR pump was being used

for shutdown cooling.

Interim measures taken by the licensee until long term corrective action can

be developed, include: (1) double sign-on of clearances on modifications to

assure proper tags are in place; (2) engineers will review test procedures

to identify untested devices such as the HFA relays which may have already

been placed in service and 3) reverification of clearances on tests which

are interrupted.

Final corrective actions will be included in the LER

submittal.

Overflowing of the fuel pool into the ventilation ducts resulted in: damage

to the duct work including approximately 150 feet of duct which fell onto

the floor next to the standby gas treatment trains; water on the -17', 20'

and 50' elevations of the reactor building; non-safety related MCC 1XJ

requiring de energization; partial loss of reactor building lighting; and

malfunctioning of the E11-F017A valve (outboard low pressure coolant

injection valve). When the ducting fell, it bent one safety related cable

,

tray; however, no cables were damaged in the tray.

The problem with the

E11-F017A valve is still being determined. The Licensee has decontaminated

l

the floors, inspected the inside of panels and MCC's and taken actions

'

necessary to resume outage work. Outage work was restarted on August S.

This event is considered an unresolved item pending further NRC review of

,

l

the event and contributing circumstances (325/85-22-05).

No violations or deviations were identified. One unresolved item is noted.

!

.

. - -

_

. .

- --