ML20070D713

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Proposed Tech Specs,Revising FSAR Section 7.6.1.1.2, Shutdown Cooling Sys Interlocks Design Basis Info
ML20070D713
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 07/07/1994
From:
SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20070D709 List:
References
NUDOCS 9407120193
Download: ML20070D713 (11)
v • d • e


Text

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San Onofre 2&3 FSAR Updated ALL OTHER INSTRUMENTATION OYSTEMS REQUIRED FOR SAFETY I

7.6.1.1.2 Design Basis Information The desi n basis for the shutdown cooling interlocks is to prevent an 5

equipment fault or an operator action from producing an unsafe condition.

The interlocks have no protective function as defined in IEr2 Standard 279-1971.

However, using Section 3 of IEEE Standard 27'3-1971 as a guideline, the following paragraphs respond to the provisions identified in Section 3 insofar as they are applicable:

A.

The interlocks shall function to prevent opening the shutdown cooling line isolation valves whenever pressurizer pressure exceeds preset value.

B.

Pressurizer pressure shall be monitored to provide the required function.

C.

Four separate, physically independent sensars located on separate pressurizer nozzles shall be provided.

Each of these sensors provides interlock / permissive signals to a separate isolation valve.

A maximum of three out of four of these sensors need to operate to perform the required system function.

f D.

Operating procedures, administrative controls, and the interlocks all serve to ensurs that the isolation valves are not opened when pressure in the RCS is greater than the design pressure of the shutdown cooling suction lines.

E.

No protective action is required.- The :ystem is protected from overpressure by relief valve PSV-9249.

7.6.1.2 Safetv Iniection Tank (SIT) Isolation Valve Interlocks 7.6.1.2.1

System Description

l Four SITS are used to flood the reactor core with borated water following RCS depressurization as a result of a loss of coolant accident-(LDCA).

During normal plant operation, each SIT is isolated from the RCS by two check valves j

in series. The SITS automatically discharge their contents into the RCS if j

system pressure decreases below the SIT pressure during power operation.

j i

Safety injection _ tank motor-operated isolation valves are provided to allow isolation of the SITS when RCS pressure is below.391 lb/in.2a The isolation valves are interlocked with pressurizer pressure measurement channels.

The SIT motor-operated isolation valves are provided with the following interlocks:

A.

The SIT isolation valves cannot be shut until RCS pressure is <

391 lb/in.2 a Section 6.3 describes the procedures for depressurizin5 the RCS.

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~2/93 7.6-3 Revision 9

9407120193 94o797 DR ADOCK 05000361

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1 NPF-10/15-437 a

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3 ATTACHMENT "A" 1

EXISTING UFSAR SECTION l

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i ATTACHMENT "B" REVISED UFSAR SECTION l

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San Onofre 2&3 FSAR Updated ALL OTHER INSTRUMENTATION SYSTEMS REQUIRED FOR SAFETY 7.6.1.1.2 Design Basis Information The design basis for the shutdown cooling interlocks is to prevent an equipment fault or an operator action from producing an unsafe condition.

The interlocks have no protective function as defined in IEEE Standard 279-1971. However, using Section 3 of IEEE Standard 279-1971 as a guideline, the following paragraphs respond to the provisions identified in Section 3 insofar as they are applicable:

A.

The interlocks shall function to prevent opening the shutdown cooling line isolation valves whenever pressurizer pressure exceeds preset value.

B.

Pressurizer pressure shall be monitored to provide the required function.

C.

Four separate, physically independent sensors located on separate pressurizer nozzles shall be provided.

Each of these sensors provides interlock / permissive signals to a separate isolation valve. A maximum of three out of four of these sensors need to operate to perform the required system function.

D.

Operating procedures, administrative controls, and the interlocks all serve to ensure that the isolation valves are not opened when pressure in the RCS is greater than the design pressure of the shutdown cooling suction lines.

E.

No protective action is required.

The system is protected from overpressure by relief valve PSV-9349.

F.

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i nterl ocks(h tof determi nesth'e? appropti atejjhutdown co;61i nglen(T may L bef o f t he.J s ameTLde si gniano / ore manu f a~ctu rerh

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Operations try c o ridi t i on(Cl a s s!1 ET l owira ng e ; p re siu fi z ejge s sb rejijid i es t[6nj ii provLide-pn(the/ con ltrolyroomfatc"thQQSPDn 7.6.1.2 Safety In.iection Tank (SIT) Isolation Valve Interlocks 7.6.1.2.1

System Description

Four SITS are used to flood the reactor core with borated water following RCS depressurization as a result of a loss of coolant accident (LOCA).

During normal plant operation, each SIT is isolated from the RCS by two check valves in series.

The SITS automatically discharge their contents into the RCS if system pressure decreases below the SIT pressure during power operation.

Safety injection tank motor-operated isolation valves are provided to allow isolation of the SITS when RCS pressure is below 391 lb/in.2a.

The isolation valves are interlocked with pressurizer pressure measurement channels. The SIT motor-operated isolation valves are provided with the following interlocks:

A.

The SIT isolation valves cannot be shut until RCS pressure is <

391 lb/in.2a. Section 6.3 describes the procedures for depressurizing the RCS.

7.6-3 Revision

NPF-10/15-437 ATTACHMENT "C" Pressurizer Pressure Transmitters Arrangement i

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ATTACHM1 R-838 X

-..m PRESSURE R-842 PRINCIPAL PRihCIPAL WIDE RANOE W OE RANGE)

ROSEMOUNT ROSEMOUNT PAWI/SWW PT PT A"I 115 ASH 9 1154SH9 RPS/ESFAS 1192-2 8192-4 R S/

AS 0-3000 PSU 0-3000 PSIA EXISTINO EXISTING ROSEWOUNT ROSEMOUNI 1153009 1153GD9 FOXBORO FOXBORO RPS/ESFAS N-E110M Pi Pi N-E11GM R?S/ESFAS CR IND 1500-2500 PSIA tt31-2 8191-4 1500-2500 PSIA CR th0 (NARROWRANOE)

(HARROW RANGE)

ROSEWOJNT ROSEMOUNT ATWS/ DSS 1154GP9RA 11 W 9RA ANS/ DSS g ; ; 4:~

g;;49 1500-2500 PSIA 1500-2500 PSIA FCXBORO CCNTROL N-E11CW 81827 1500-2500 PSIA FOXBORO pg EPPM N-E11GW g;g4, 0-1600 PSIA LOW RANGE LOW RANGE ROSEWOUNT ROSEWOUNT DCS pg 9196-4 INTERLOCK pg SOCS 0H8 9134-2 0-7 EXISTING EXISTING ROSEWOUNT ROSEMOUNT 1153009 1153G09 j

PRESSURIZER PRESSURE TRA N0ft: ALL TRANSMITTERS ARE LOCATED INSIDE CONTAINW1 s

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- C0h0ENSATE CHAMBER l; M R '

'd' (TTP. A PLCS)

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,,c,LJ R-940

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f. ' <.m Ha!We cn ep t iGJ :e; C rf.-d ZER R-943 PRINCIPAL PRihCIPAL F M TIONS WIDE RANOE WD RANCE ROSEWOUNT' ROSEVOUNT pg p7 py pyygj3yy RPS/ESTAS 6102 9182-1 R M/ W AS g,3g 3

3 p3;g EXISTING EXISTING ROSEWOUNT ROSEMOUNT 1153009 1153009 FOX 8010 FOXBORO RPS/ESTAS N-E110M Pi

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6181-1 1500-2500 PSIA CR IND Fi N-EllGW RPS/ESTAS CR lND 1500-2500 PS!A e:ci-3 (NARROW RAN0E)

(hARRO# RANGE)

ROSEWOJNT ROSEM0JNT Al#5/055 ItS40P3RA gfg 4g 1154GP9RA ATWS/ DSS ggggg 1500-250D P5IA 1500-2500 PSIA FOXBORO EI h-EllGW CONTROL 1520-2500 FSIA s

i LOW RA90E LOW RANCE ROSEWOUNI ROSEWOUNT S005 p;

p; gg INTERLOCK

$165 8183-1 INTERLOCK g_7 g

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EXISTING EXISilNG TOXBORO FOX 8ORO N-El1GW N-EllGW NSMITTERS ARRANGEMENT

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NPF-10/15-437 ATTACHMENT "D" Pressurizer Pressure Indication Data r

ATTACHMENT D PRESSURIZER PRESSURE INDICATION DATA TRANSMITTER RANGE POWER SOURCE TRANSMITTER CONTROL ROOM INDICATOR PT0101-1 1500 TO SR SR FOR ALL 4 CHANNELS INDICATORS 2500 ON PPS CONTROL PANEL.

PT0101-2 NSR FOR CHANNELS 1 & 2 PT0101-3 INDICATORS ON REACTIVITY CONTROL PANEL.

PT0101-4 PT0102-1 0 TO 3000 SR SR FOR ALL 4 CHANNELS INDICATORS ON PPS CONTROL PANEL PT0102-2 AND CHANNELS 1 & 2 QSPDS DISPLAYS. NSR FOR CHANNELS 1 & 2 INDICATORS & RECORDERS-0N PT0102-3 REACTIVITY CONTROL PANEL.'NSR FOR ALL 4 CHANNELS PMS COMPUTER PT0102-4 INPUTS. NSR FOR CHANNELS 3 & 4 EVAC SHUTDOWN PNL INDICATORS.

PT0103-1 0 TO 750 SR NSR FOR CONTROL ROOM INDICATORS

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PT0104-2 PT0105-3 0 T0 750 SR NSR FOR PMS COMPUTER INPUTS PT0106-4 PT0104A 0 TO 1600 NSR NSR FOR ESSENTIAL PLANT PARAMETERS MONITORING PANEL INDICATION.

'PT0100X 1500 TO NSR NSR FOR CONTROL ROOM RECORDERS-2500 AND PMS/CFMS COMPUTER INPUTS.

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NPF-10/15-437 ATTACHMENT "E" ALTERNATIVES TABLE 4

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ATTACHMENT E

ALTERNATIVES TABLE ALTERNATIVE IN ORDER OF SUBC00 LED SHUTDOWN COOLING COST SENSOR REMARKS PREFERENCE MARGIN ACCURACY OPI ACCURACY ESTIMATE DIVERSITY

1. ALL LOW-RANGE GOOD GOOD BASE NO RECOMMENDED TRANSMITTERS ROSEMOUNT MODEL 1154' SERIES H
2. REPLACE ONLY 2 HIGH TLU ON HIGH TLU ON THE

$100,000.00 YES NOT EXISTING ROSEMOUNT CHANNEL 1 FOXBORO LESS THAN RECOMMENDED TRANSMITTERS WITH NEW TRANSMITTERS THE BASE MODEL 1154 SERIES H &

COST PER RETAIN EXISTING FOXBORO UNIT TRANSMITTERS

3. RETAIN THE EXISTING GOOD HIGH TLU ON THE

$500,000.00 YES N(TT FOXBORO TRANSMITTERS, FOXBORO

.MORE THAN RECOMMENDED REPLACE EXISTING TRANSMITTERS THE BASE ROSEMOUNT TRANSMITTERS COST PER WITH NEW ROSEMOUNT UNIT MODEL 1154 SERIES H AND ADD DEDICATED ROSEMOUNT 1154 SERIES H FOR SUBC00 LED MARGIN

NPF-10/15-437 ATTACHMENT "F" Figure, Titled: Shutdown Cooling Valve Arrangement 1

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ATTACHMENT F EXISTING SHUTDOWN COOLING SYSTEM ISOLATION VALVE ARRANGFV':,i h

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' PT-6103-1 TO

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PT-0104-2l FOXBORO ~

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INSIDE CONTAINNENT l CONTAINWENT is-is-l k

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FOXBORO PWS ROSEWOUNT SYSTEM g

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HV-9378 e-r0wrR LOCxED Oui

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