ML20151K390

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Forwards Summary of 880624 Enforcement Conference Re Inoperability of Svc Water Sys & Inadequate post-trip Review,Per Insp Rept 50-395/88-13.List of Attendees & Handout Also Encl
ML20151K390
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 07/22/1988
From: Grace J
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To: Nauman D
SOUTH CAROLINA ELECTRIC & GAS CO.
References
EA-88-051, EA-88-51, NUDOCS 8808030174
Download: ML20151K390 (30)


See also: IR 05000395/1988013

Text

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JUL 2 21988

Docket No. 50-395

License-No. NPF-12

EA 88-51

South Carolina Electric and Gas Company

ATTN: Mr. D. A. Nauman, Vice President

Nuclear Operations

P. O. Box 88

Jenkinsville, SC 29065

Gentlemen:

SUBJECT: ENFORCEMENT CONFERENCE SUMMARY

(NRC INSPECTION REPORT N0. 50-395/88-13)

This letter refers to the Enforcement Conference held at our request on

June 24, 1988. This conference concerned activities authorized for your

V. C. Summer facility. The issues discussed related to the inoperability of

the service water system and an inadequate post trip review. A list of

attendee:, a sunmary and a copy of your handout are enclosed. We are  ;

continuing our rev;aw of these issues to determine the appropriate enforcement i

action.

In accordance with Section 2.790 of the NRC's "Rules of Practice," Part 2, '

Title 10, Code of Federal Regulations, a copy of this letter and its enclosures )

will be placed in the NRC Public Document Room. i

Should you have any questions concerning this letter, please contact us. I

Sincerely,

J. Nelson Grace

Regional Administrator

Enclosures:

1. Enforcement Conference Summary

2. List of Attendees

3. Handout (s)

cc w/encis: (See page 2)

8808030174 880722 ' \

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ADOCK 05000395

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South Carolina Electric 'E 2 N

and Gas Company 2

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cc w/encis:

0. S. Bradham, Director, Nuclear

Operations

J. L. Skolds, Deputy Director,

Operations and Maintenance

J. B.~Knotts, Jr.

Bishop, Cock, Purcell & Reynolds

W. A. Williams, Jr. , Technical

Assistant, Nuclear Operations -

Saritee Cooper

A. R. Koon, Jr., Manager

Nuclear Licensing

R. E. Rainear, Executive Vice President,

South Carolina Public Service Authority

bec w/encis:

J. Lieberman, DOE

G. R. Jenkins, EICS

DRS, Technical Assistant

J. J. Hayes, Project Manager, NRR

Document Control Desk

State of South Carolina

NRC Resident Inspector

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. JUL 2 21988

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ENCLOSURE 1

MEETING SUMMARY

On June 24, 1988, rep,resentatives of South Carolina Electric and Gas Company

(SCE&G) attended an Enforcement Conference at the request of the NRC in the NRC

Region II Office in Atlanta, Georgia. The meeting was held to discuss NRC

concerns pertaining to a May 12, 1988 event where entry into Modes 2 and I were

made with both trains of the Reactor Building Cooling Units (RBCU) of the

Service Water (SW) System inoperable. The post trip review failed to detect

that RBCUs were inoperable due to low SW flow.

The NRC Region II Deputy Regional Administrator opened the meeting by reviewing

the NRC concerns pertaining to the switching of operational Modes while both

trains of RBCUs were inoperable and the failure of the post trip review to

identify the discrepancy.

The Vice President of SCE&G gave an opening statement. He then turned the

presentation over to his staff. SCE&G representatives provided a presentation

discussing those topics indicated in the attached handout which was distributed

to meeting attendees by SCE&G. Highlights of this presentation are provided

below:

The licensee provided the sequence of events, the reasons for the restart,

priority given to annunciators, post trip review, and post event actions. A

system description was provided for the service water system technical specifi-

cation affected, performance history and future plans. The licensee described

the reason why they failed to detect the low flow to the RBCUs in that they

reviewed the computer post trip review data, verified that SW pumps and SW

Booster pumps started and the pumps reached the required flow. However, the

review did not go far enough to show that the flow started decreasing below the

minimum level after 120 seconds from the time the pumps started. One of the

future plan actions to be incorporated is a graphical presentation of the post

trip data. This will provide a more visible means to identify any parameter

below the required values. The licensee stated that they took prompt correc-

tive action of declaring both trains inoperable after their independent review

determined SW flow to the RBCUs was below that required. They claimed that

they did not violate the action statemente of the Technical Specifications.

They stated that at the time of Mode changes they were not aware of the low

flows, that they did an adequate post trip review and all systems were func-

tioning properly. Nevertheless, corrective actions have been initiated to

prevent recurrence.

The NRC is presently considering enforcement action on this issue. This

meeting served to enhance tne NRC's understanding of the event and corrective

actions taken to assure proper flow through the RBCUs.

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JUL 2 2 Iggg

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ENCLOSURE 2

LIST OF ATTENDEES

South Carolina Electric & Gas Company:

D. Nauman, Vice President, Nuclear Operations

0. Bradham, Director, fiuclear Plant Operations

J. Skolds, General Manager, Station Operations

G. Soult, Manager, Operations

G. Taylor, Associate Manager, Shift Engineering

J. Burke, Control Room Supervisor

R. Clary, Manager, Design Engineering

A. Koon, Manager, Nuclear Licensing

NRC Representatives:

M. Ernst, Deputy Regional Administrator

C. Hehl, Deputy Director, Division of Reactor Projects (DRP)

E. Merschoff, Deputy Director, Division of Reactor Safety

R. Goodard, Regional Counsel

G. Jenkins, Director, EICS

H. Dance, Chief, Projects Section 18, (DRP)

B. Uryc, Enforcement Specialist, Enforcement and Investigation

Coordination Staff (EICS)

L. Modenos, Project Engineer, Projects Section 18, DRP

R. Bernhard, Reactor Engineer, TPS, DRS

E. Reeves, Senior Project Manager, NRR

J. Hayes, Jr. , Project Manager, NRR

F. Jape, Chief, TPS, DRS

R. Prevatte, Senior Resident Inspector, Summer, DRP

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EHCLOSURE 3

LICENSEE 14EETlHG 80TES

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ENCLOSURE 3

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NRC ENFORCEMENT CONFERENCE

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JUNE 24,1988 '

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ATLANTA, GEORGIA

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S C E & G ATTENDEES

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ENFORCEMENT CONFERENCE

June 24,1988

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Dan Nauman - Vice President, Nuclear Operations I

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Ollie Bradham - Director, Nuclear Plant Operations

Jack Skolds - General Manager, Station Operations

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Gene Soult - Manager, Operations

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Gary Taylor - Associate Manager, Shift Engineering

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Johnny Burke - Control Room Supervi.sor .

Ron Clary - Manager, Design Engineering

Al Koon - Manager, Nuclear Licensing I

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ENFORCEMENT CONFERENCE AGENDA

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June 24,1988

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l. Introduction Dan Nauman

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Vice President,

Nuclear Operations

11. Sequence of Events

e initiating Event to Restart Gene Soult i

Manager, Operations l

ee Annunciator Gene Soult

Manager, Operations

se Post Trip Review Gary Taylor .

Associate Manager,  !

Shift Engineering

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e Post Event Actions Gene Soult

Manager, Operations l

lil. Service Water System Jack Skolds 1

General Manager,

Station Operations

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e Description

e Technical Specifications

e Performance History

e Future Plans

IV. Summary / Conclusions Ollie Bradham

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Director, j

Nuclear Plant Operations

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Gene Soult l

Sequence of Events

i nitiating Event to Restart

Annunciator

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CLOSURE OF "A" MSIV EVENT

l. PART ONE

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A. PLANT WAS OPERATING AT 100% POWER - ON LINE 191 OF

THE PREVIOUS 192 DAYS.

B. PERFORMING PARTIAL STROKE TESTING OF MAIN STEAM

ISOLATION VALVES WHEN " A" MSIV CLOSED.

C. IMPLEMENTED EMERGENCY OPERATING PROCEDURE FOR

SAFETY INJECTION / REACTOR TRIP. , ,

D. IMPLEMENTED EMERGENCY PLAN PROCEDURES. ,

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CLOSURE OF " A" MSIV EVENT (CON'T.)

ll. OPERATOR RESPONSE TO ANNUNCIATORS

A. PRIORITY SCHEME

B. TRAINING ON ANNUNCIATORS:

1. NORMAL PLANT CONDITIONS

2. UPSET CONDITIONS

C. EMERGENCY OPERAflNG METHODOLOGY, ,

Ill. POST TRIP REVIEW - GARY TAYLOR

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Gary Taylor

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Post Trip Review

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POST TRIP REVIEW

9 PRELIMINARY REVIEW BY THE SHIFT ENGINEER

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- INDEPENDENT EVALUATION OF THE RX TRIP & Si

- DETERMINATION OF THE ULTIMATE CAUSE OF THE EVENT

- EVALUATION OF PLANT RESPONSE TO THE TRANSIENT

- VERIFICATION OF SAFETY EQUIPMENT

- COMPARISON TO THE TRANSIENT OF MARCH 17,198S

- DETERMINATION OF RELEASES TO THE ENVIRONMENT

o DOCUMENTS REVIEWED PRIOR TO START-UP

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- OFF NORMAL OCCURRENCE REPORT *  !

- EOP 1.1, POST TRIP REPORT *

- PLANT COMPUTER SEQUENCE OF EVENTS *

- PLANT COMPUTER ALARM MESSAGES *

- PLANT COMPUTER POST TRIP REVIEW *

- TECHNICAL SUPPORT COMPUTER DISCRETE CHANGES LOG *

- TECHNICAL SUPPORT COMPUTER POST TRIP REVIEW

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[* DOCUMENTS REVIEWED PER SCE&G RESPONSE TO GENERIC LETTE

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e RESOURCES EMPLOYED IN THE RESTART REVIEW

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- OPERATIONS ENGINEER

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- ADMINISTRATIVE SHIFT ENGINEER

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- MANAGER, OPERATIONS

- DUTY SHIFT SUPERVISOR

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o REVIEW OF SERVICE WATER TO THE RBCU'S

- VERIFICATION OF SW PUMP AND SW BOOSTER PUMP START

- VERIFICATION OF 4000 GPM TO THE RBCU'S

- PLANT COMPUTER ALARMS NOT PRESENT ON B TRAIN

- LACK OF HISTORICAL DATA FOR COMPARISON

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i'*:%3:46 66.1 66.6 0.0 0.0 140.8 89.2 0.0 96.5 996.6 968.9 8457.1 8704.3 80.8 80.9

'48%3:56 66.1 66.6 0.0 0.0 J33.8 89.3 0.0 96.5 994.4 967.5 8315.1 8773.0 80.8 80.9

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52:06 66.1 66.6 0.0 0.0 402.2 89.3 0.0 96.5 999.9 967.5 8465.2 9048.7 80.8 80.9

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66.1 66.6 4408.1 4119.0 4182.9 87,8 4002.3 92.5 906.7 887.4 7442.4 7866.8

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4055.9 90.1 910.3 890.0 7432.2 7630.0 80.7 80.9

!4:53:56 66.1 66.6 4392.9 40*9.3 4099.5 86.7 4064.1 89.4 908.9 886.3

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14:54 26 46.1 66.6 3929.0 3958.4 3666.0 80.5 80.9

83.3 3844.6 89.4 91986 083.3 7559.2 7666.6 80.5 80.9

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!*:54:46 66.0 66.6 3919.4 2575.8 3687.1 77.1 2514.4 R3.3

l0 :54:56 66.0 66.6 39J8.7 2288.5 3695.2 918e6 912.4 7573.0 7708.7 80.5 88.8

!0:55 06 74.8 2264.3 80.9 921e4 927.9 7523.4 7965.7 80.4 80.8

66.0 46.6 3902.9 2146.7 3675.7 73.3 2073.7 77.9 922 8

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0:55:26 72.0 2026.8 76.3 918.92 928.4 7551.8 8499.0 80.4

66.0 66.6 3950.1 2647.8 3676.1 71.4 1975.7 75.1 80.8

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'0:55:46 70.8 1968.4 73.7 923.4 936.9 1482.4 8266.9 88.4

66.1 66.6 3937.7 1933.6 3701.0 70,2 2905.7 73.2 80.8

0:45 56 66.1 66.6 3923.1 1961.8 3640.9

916,9 934.8 7652.2 8124.7 80.4 80.8

0:56:06 69.8 1935.5 72.6 925.5 931.6 7515.1 8363.3

66.1 66.6 3902.9 1961.8 3705.1 69.8 1914.5 72.6 88.4 80.8

Pa%6: 16 66.1 86.6 3922.7 1977.6 3637.1 922.8 935.5 7455.4 4145.9 80.4 80.8

p 96:24 69.8 1958.1 72.0 924.4 933.9 7412.7 8344.5 80.4

66.1 66.6 3942.3 1916.1 3636.9 69.0 1937.1 ,73.0 80.8

P56:33 66.1 66.6 3912.6 1955.5 3725.6 918.4 932.5 7521.7 8491.6 80.4 80.8

69.8 1926.0 72.0 919.2 930.6 7513.8 8285.1

0:56:46 66.1 66.5 39:3.4 1942.2 3670.9 69.4 1969.9 51.5 80.4 80.8

355:53 66.1 66.5 3901.3 1986.4 3640.3 924.5 934.1 7561.3 8332.0 80.4 80.7

397:06 66.1 69.2 1908.5 71.5 928.4 937.5' 7510.0 8495.3

66.5 3897.8 1910.1 3618.2 69.2 1877.9 '71.5 80.3 80.7

357:16 66.1 66.5 3902.3 1908.1 3645.3 920.4 933,9 741n,7 80g7.2 80.3 80.7

D:57:26 66.1 66.5 3901.3 18*2.1 3644.5

69.2 1884.0 71.5 919.2 932.3 7570.9

69.2 1909.3 8271.1 80.3 80.7

71.5 922.9 935.6 7525.5 8218.9 80.3 80.7

' Ora stAPT DATra 05/12/88 * 1 M NUTE PnST= TRIP DATA *

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  • ISEG POST TRIP REVIEW

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- INDEPENDENT EVALUATION OF THE RX TRIP & SI

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  • POST TRIP ENHANCEMENTS

- STRUCTURED POST TRIP REVIEW

a. GRAPHICAL PRESENTATION OF POST TRIP DATA

b. PLANT RESPONSE CHECKLIST

c. REVIEW GUIDE WHICH WILL INCLUDE NORMAL

OPERATING BANDS , INSTRUMENT SETPOINTS,

CONTROL AND PROTECTION FUNCTIONS AND

TECHNICAL SPECIFICATIONS

- PLANT & TSC COMPUTER REPLACEMENT IN PROGRESS

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POST EVENT ACTIONS - GENE SOULT

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EXAMPLE OF THE NEW GRAPHICAL FORMAT .~

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POST EVENT ACTIONS

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PART 11

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OPERATIONS MANAGEMENT NOTIFIED OF POSSIBLE LOW SW i

FLOW TO RBCU..

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A. DECLARED BOTH TRAINS INOPERABLE BASED ON POST TRIP

DATA.

B. INITIATED TESTING OF SW TO RBCU'S.

C.

DECLARED " A" TRAIN SW TO RBC f5 OPERABLE. ,

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D. CHECKED FUNCTIONAL SYSTEM COMPONENTS.

E.

INITIATED CHEMICAL FLUSH "6" TRAIN RBCU'S.

F.

DECLARED "B" TRAIN SW TO RBCU'S OPERABLE.

G. CHEMICAL FLUSH OF " A" TRAIN.

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POST-EVENT ACTIONS (CON'T)  !

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11.

INCREASE FREQUENCY FROM 18 MONTH SURVEILLANCE OF FLOW

TO MONTHLY FLOW VERIFICATIONS.

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A. TESTED " A" SWBP SAT ON 6/21/88.

Ill. OBSERVED REDUCED FLOW OF SW TO "B" TRAIN RBCU'S

A. INSPECTED SW PUMP BAYS FOR CLAM INFESTATION.

B.

PERFORMED a P CHECKS OF VARIOUS "B" TRAIN HEAT

EXCHANGERS. ,

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IV.

SIMULATED BLACKOUT TESTING FOR WORST CASE TRANSIENT ON

SYSTEM

V. SERVICE WATER SYSTEM - JACK SKOLDS

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Service Water System

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SERVICE WATER / REACTOR BUILDING  :

i COOLING UNITS

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e ' System Description

e Technical Specifications

e Problems Encountered

e Future Plans

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_ _ _ _ _ _ - _ _ _ _ _ _ _ _ __ _ _ _ - _ _ - - _ _ _ . _ - _ - - - _ - - - -

._

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\

I

D

.

PLANT SYSTEMS _

)

3f,4_.7.4 SERV!CE WATER SYSTEM

L_IMITING CONDITION FOR OPERATION

__

3.7.4 At least.two independent service water loops shall be OPERABLE. I

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

!

With only one service water loop OPERABLE, restore at least two loops 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 be in at least HOT STANDBY within the next

6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUT 00WN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

I

SURVEILLANCE REQUIREMENTS 4.7.4 At least two service water loops shall be demonstrated OPERABLE:

a.

At least once per 31 days by verifying that each valve (ma'nual,

power operated or automat 1c) servicing safety related equipment that

is not locked, sealed, or otherwise secured in position, is in its

correct position.

SUMMER - UHli 1 3/4 7-12 Amendment No. 21

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1

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CONTAINMENT SYSTEMS

REACTOR BUILDING COOLING SYSTEM

LIMITING CONDITIONS FOR OPERATION

3.6.2.3 Two independent groups of reactor building cooling units shall be

OPERABLE with at least one of twc cooling units OPERABLE in slow speed in each

group. .

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

a. With one group of the above required reactor building cooling units

inoperable and both reactor building spray systems OPERABLE, restore l

the inoperable group of cooling units to OPERABLE status within l

7 days or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in

COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

l

b. With two groups of the above required reactor building cuoling units

inoperable, and both reactor building spray systems OPERABLE, restore

at least one group of cooling units to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> I

or be in at least HOT STANOBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLO l

SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Restore both above required

groups of cooling units to OPERABLE status within 7 days of Initial

loss or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in

COLD SHUT 00WN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

c. With one group of the above required reactor building cooling units

inoperable and one reactor building spray system inoperable, restore

the inoperable spray system 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 be

in at least HOT STANDBY within the next 6 hcurs and in COLD SHUT 00WN

within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Restore the inoperable group of

containment cooling units to OPERABLE status within 7 days of initial

loss or be in at least HOT STAN0BY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in

COLO SHUT 00WN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVE*LLANCE REQUIREMENTS

4.6.2.3 Each group of reactor building cooling units shall be demonstrated

OPERABLE:

a. At least once per 31 days by:

1. Starting each cooling unit group from the control room, and

verifying that each cooling unit group operates for at least

15 minutes in the slow speed mode.

b. At least once per 18 months by:

1. Verifying that each f an group starts automatically on a safety

injection test signal.

2. Verifying a cooling water flow rate of greater than or equal to g

4,000 gpm to each cooling unit group. N

SUMMER - UNIT 1 3/4 6-14

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SERVICE WATER SYSTEM HISTORY l

3/87 Identified High Ap on B Train RBCU.

-

1

Inspected RBCU 28 Cooler (Worst Ap) with

Fiberscope. Clean and very few clams. (2 of 22

tubes)

Inspected CCW HX. Very few clams.

1

4/87 Reviewed design data of coolers and pumps.

l

Reviewed Section XI test data. l

1

Ran Flow Balance Test. Met flow rate for 95 F.

Ap's were very close to design requirements.

l

S/87 Ran integrated safeguards test. Satisfactory.

Provided guidance to Operations.

, ,- - . , , - - - - __, - , - - , , _ , . - . , - . , ---., n , , - , e a , -r,- .

~

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FUTURE PLANS

  • Modification to RBCU Valves, to increase flow

marg'in

- 2000 gpm requirement

- Technical Specification change approved

  • Possible Strainer / Bypass Loop
  • More Sophisticated Testing

.

-

"C" SW Pump

- More instrumentation

- Visualinspection Refuel 4

- Possible Flush / Filter (Later)

e Determine Cause of Flow Degradation

- Presently do not believe cause to be clams

t _ _ .

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

- - - - -

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_

Ollie Bradham

.

Summary / Conclusions

1

i

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1

l

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0 *

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  • %s

_

NRC ENFORCEMENT CONFERENCE

'

JUNE 24,1988

<

SUMMARY

WE DID NOT VIOLATE SPECIFICATION

3.0.4. .

MANAGEMENT FOCUS ON SAFETY

VERSUS ECONOMICS

CHECKS AND BALANCES WORKED

DEDICATED TO RESOLVING PROBLEM

,

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