Text

Amend 14 to License NPF-86,changing TS to Implement Guidance of Generic Ltr 91-08, Removal of Component Lists from TS & Revising TS 3.6.3 to Permit Locked or Sealed Closed Containment Isolation Valves to Be Opened
	ML20114C863
Person / Time
Site:	Seabrook
Issue date:	08/27/1992
From:	Butler W; Office of Nuclear Reactor Regulation
To:	;
Shared Package
ML20114C864	List: ML20114C863; ML20114C868;
References
	GL-91-08, GL-91-8, NUDOCS 9209030284
	Download: ML20114C863 (15)
	v • d • e

___

g&3 884

'o UNITED STATES 8'

NUCLEAR REGULATORY COMMISSION i

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,d NORTH ATLANTIC _[NERGY SERVICE CORPORATION. ET AL.*

QQCKET No. 50-40 SEABROOK STATION. UNIT NO. 1 eEENDMENT TO FACILITY OPERATING LICENSE Amendment No.14 License No. NPF-86 1.

The Nuclear Regulatory Commission (the Commission or the NRC) has found that:

A.

The application for amendment filed by the North Atlantic Energy Service Corporation (NAESCO) (the licensee), acting for itself and as agent and representative of the 11 other utilities listed below and hereafter referred to as licensees, dated June 11, 1992, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's rules and regulations set forth in 10 CFR Chapter I; B.

The facility will operate in conformity with the application, the provisions of the Act, and the rules and regulations of the Commission; C.

There is reasonable assurance: (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations set forth in 10 CFR Chapter I; D.

The issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public; and E.

The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have been satisfied.

North At h ntic Energy Service Corporation is authorized to act as agent for the North Atlantic Energy Corporation, the Canal Electric Company, The Connecticut light and Power Company, EUA Power Corporation, Hudson Light &

Power Department, Massachusett" Municipal Wholesale Electric Company, Montaup Electric Company, New Englant *

..r Company, New Hampshire Electric Cooperative, Inc., Taunton Municipal Light Plant, The United Illuminating Company, and Vermont Electric Generation and Transmission Cooperative, Inc.,

and has exclusive responsibility and control over the physical construction, operation and maintenance of the facility, r

9209030204 920827 PDR ADOCK 05000443 P

PDR

2.

Accor(ingly, the license is amended by L,anges to the Technical Specifications as indicated in the attachment to this lictnse amendment, and paragraph 2.C.(2) of facility Operating License No. NPf-86 is hereby amended to read as follows:

(2) lethnical SagttihJLt10R1 The Technical Specifications contained in Appendix A, as revised through Amendment No. M, and the Environmental Protection Plan contained in Appendix B are incorporated into facility License No.

NPF-86. NAESCO shall operate the facility in accordance with the Technical Specifications and the Environmental Protection Plan.

3.

This license amendment is effective as of its date of issuance and shall be implemented within 60 days of receipt of this letter.

FOR THE h. EAR REGULATORY COMMISSION

/'

w

.f Walter Butler, Director Project Directorate 1-3 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation

~

Attachment:

Changes to tne Technical Specifications Date of issuance: August 27, 1992 k

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f ATTACHMENT TO LICENSE AMENDMENT NO.14 FACILITY OPERATING LICENSE NO. NPF-86 DOCKET NO. 50-443

-/

R place the following pages of the Appendix A Technical Specifications with t e attached pages.

The revised pages are identified by Amendment number and 4

= c ntain vertical lines indicating the area of change.

Overleaf pages have t)eenprovided.

Remove Insert vil

vii viii viii*

3/4 6-1 3/4 6-1 3/4 6-2

)/4 6-2 3/4 6-5 3/4 6-5 3/4 6-6 3/4 6-6 3/4 6-15*

3/4 6-15*

3/4 6-16 3/4 6-16 3/4 6-17 3/4 6-17 3/4 6-18*

3/4 6-18*

B 3/4 6-3 8 3/4 6-3 8 3/4 6-4 B 3/4 6-4 1

l l

l

/

LIMITING CONDITIONS FOR SECTION OPERATION 1H.PD AND SURVEILLANCE Containm RE Pr Air L UIREMENTS Internal ant ContainmAir Temper turee s s ure.ocks............

a Containm ent Vess.

3/4.6 2 ent el......................................

PAGE Structur l Ventilation Syst DEPRESSURIZATION a

In em... t eg r......................

3/4 ity.

6-7 Containm AND COOLING 3/4 6-9 3/4.6.3 Spr y Additivent Spray System SYSTENS 3/4 a

3/4 6-10 3/4 6 11 3/4 6.4 CONTAINMENT e

System................

6-12 COMBUSTIBLE ISOLATION VAL VES......

GAS Hydrogen Monit CONTROL 3/4 Electric Hydroge....

3/4 6 14 ors 6 15 Hydrogen Mixin 3/4.6.5 n Reco......

3/4 6 16 g Sys tem.mb iner.................

CONTAINMENT s.

ENCLOSURE................................

ContainmContainment Encl BUILDING...........................

3/4 osure Em 3/4 6-18 Containment En l ent Enclosure Buil 3/4 6-19 3/4. 7 ergency Air Clean PLANT 6-20 c osur ding Integrity up System.

3/4. 7.1 SYSTEMS e BuildinD Str TURBINE uctural................

CYCLE Integrity.......

3/4 3/4 6*21 TABLE Safety Va1v 3/4 6-24 SETPOINTMAXIMUM es............

6-25 3.7-1 ALLOWABLE POWER.................

TABLE3.7-2FOUR-LOOP WITH INOPERA RANGE LINE09 ERA TION...BLE STEAM STEA NEUTRON...............

\\

SAFETY........M LINE S

FLUX

\\

Auxiliary Feed VALVES PER........AFETY VAL HIGH 3/4 7-1 Condensate Storwater System L00P............VES

\\

DURI Specific Activit age Tank............................NG TABLE4. 7-1 ANDSECONDARYy.............................

3/4 7-2 3/4 ANALYSIS PR0GRAMCOOLANT 7-2 SYSTEM Atmospheric ReliMain Steam Line I

......... SPECIFIC.................

3/473

.........AC TI VI TY 3/4 7-6 solation Va1ves......... SAMPLE 3/4 7-7 ef Valves...................

......................... 3/4 7-8 ROOK UNIT 3/4 7-9 1

3/4 7-10 vii Am endment No.14

,/

y/

N UIREMENTS SURVEILLANCE RE PAGE 7-11 AND 3/4 OPERATION 3/4 7-12 CONDITIONS FOR RE LIMIT ATION.................

7-13 3/4 3/4 7-14 LIMITING PRESSURE /TEMPERATUW ATER SY 3/4 7-19 7 16 3/4 COOLING STEAM GENERATORPRIMARY COMPON SECTION TRATION 7-20 SY ST EM...............

AIR AND 3/4 7 22 SINK................... FIL...............

3/4.7.2 WATER MAKEUP 3/4 7 23 3/ 4,7,3 SERV!CEROOM EMERGENCY HEAT 3/4

..................not used)...........

ULTIMATE 3/4.7.4 CONTROLSUBSY STEM..............

7-24 3/4.7.5 3/4 SNUBBERS...............

ION....

CONTAMINAT r is 3/4.7.6 MONIT ORING.........

numbe SOURCE 3/4.7.7 SEALED specification TEMPERATURE 3/4.7.8 (This 3/4.7.10 TEMPERATURE MONIT 3/48-1 3/4.7.9 AREA AREA TABLE POWER

................. 3/4 8-10 3.7-3 SYSTEMS ELECTRICAL 3/4 8-11 SCHEDULE.....................

'/4.8 A.C. SOURCES Operating.............

3/4.8.1 TEST 3/4 8-12 GENERATOR..............

DIESEL 8-14 3/4 4.8-1 Shutdown..............

TABLE 8-15

................. REQUIRE 3/4 0.C. SOURCES 3/4.8.2 Operating............. SURVEILLANCE.......

3/4 8-BATTERY 3/4 8-3/4 8 4.82 Shutdown.............. POWER DIST N

TABLE DNSITE

/

Operating............. Shutdown.............

3/4 3/4.8.3 for Inverter 1-2A..... DEVICES PROTECTIVEContainme CircuitEQUIPMENT t

tor Overcurren Trip for 3/'

ELECTRICAL ide Primary Protective Devicescted 3/4.8.4 A.C. Circuits InsPenetration Condu 3/

and

................ Overload Pr ContainmentProtective DevicesPower Circuits..............

l Class 1E Valves Therma Motor-OperatedOPERAT._I_O._NS.

1E

/

REFUELING CONCENTRATION.....

3/4.9 INSTRUMENT ATION....... T BORON 3/4.9.1 3/4.9.2 DECAY viii 3/4.9.3 1

SEABROOK UNIT

i INDEX LIMITING CONDITIONS FOR OPERATION AND SURVEILLANCE REQUIREMENTS SECTION PAGE Containment Air Locks....................................

3/4 6 7 Internal Pressure........................................

3/4 6-9 Air Temperature..........................................

3/4 6-10 Containment Vessel Structural Integrity..................

3/4 6-11 l

Containment Ventilation System...........................

3/4 6-12 3/4.6.2 DEPRESSURIZATION AND COOLING SYSTEMS containment Spray System.................................

3/4 6 14 Spray Additive System....................................

3/4 6-15 3/4.6.3 CONTAINMENT ISOLATION VALVES.............................

3/4 6-16 3/4.6.4 COMBUSTIBLE GAS CONTROL Hydrogen Monitors........................................

3/4 6-18 Electric Hydrogen Recombiners............................

3/4 6 19 Hydrogen Mixing System...................................

3/4 6-20 3/4.6.5 CONTAINMENT ENCLOSURE BUILDING Containment Enclosure Emergency Air Cleanup Systes.......

3/4 6-21 I

Containment Enclosure Building Integrity.................

3/4 6-24 Containment Enclosure Building Structural Integrity......

3/4 6-25 3/4.7 PLANT SYSTEMS 3/4.7.1 TURBINE CYCLE 1

Safety Va1ves............................................

3/4 7-1 TABLE 3.7-1 MAXIMUM ALLOWABLE POWER RANGE NEUTRON FlVX HIGH SETPOINT WITH INOPERABLE STEAM LINE SAFETY VALVES DURING FOUR-LOOP 0PERATION......................................

3/4 7-2 TABLE 3.7-2 STEAM LINE SAFETY VALVES PER L00P.....................

3/4 7-2 Auxi l i a ry Feedwate r Sys tem...............................

3/4 7 Condensate Storage Tank..................................

3/4 7-6 Specific Activity........................................

3/4 7-7 TABLE 4.7-1 SECONDARY. COOLANT SYSTEM SPECIFIC ACT! /ITY SAMPLE

~ AND ANALYSIS PR0 GRAM.....................................

3/4 7-8 l

Main Steam Line Isolation Va1ves.........................

3/4 7-9

- Atmospheric Relief Va1ves................................

3/4 7-10

. SEABROOK - UNIT 1-vii Amendment No.14

d I

INDEX l

LIMITING CONDITIONS FOR OPERATION AND SURVEILLANCE REQUIREMENTS SECTION PAGE i

3/4.7.2 STEAM GENERATOR PRESSURE / TEMPERATURE LIMITATION..........

3/4 7-11 3/4.7.3 PRIMARY COMPONENT COOLING WATER SYSTEM...................

3/4 7-12 3/4.7.4 SERVICE WATER SYSTEM.....................................

3/4 7 13 3/4.7.5 ULTIHATE HEAT SINK.......................................

3/4 7-14 3/4.7.6 CONTROL POOM EMERGENCY MAKEUP AIR AND FILTRATION i

1 SUBSYSTEM..............................................

3/4 7-16 3/4.7.7 SNUBBERS.................................................

?/4 7-19 3/4.7.8 SEALED SOURCE CONTAMINATION..............................

3/4 7-20 3/A.7.9 (This specification number is not used)..................

3/4 7-22 3/4.7.10 AREA TEMPERATURE MONITORING.........................,._,..

'/4 7-23 l

TABLE 3.7-3 AREA TEMPERATURE MONITORING...........................

3/4 7-24 3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES 0perating................................................

3/4 8-1 TABLE 4.8-l' DIESEL GENERATOR TEST SCHEDULE........................

3/4 8-10 Shutdown.................................................

3/4 8-11 3/4.8.2 D.C. SOURCES 0perating................................................

3/4 8-12 TABLE 4.8-2 BATTERY SURVEILLANCE REQUIREMENTS.....................

3/4 8-14 Shutdown.................................................

3/4 8-15 3/4.8.3 ONSITE POWER DISTRIBUTION 0perating................................................

3/4 8-16 Shutdown.................................................

3/4 8-18 Trip Ci rcui t f or Inverter 1-2A...........................

3/4 8 19 3/4.8.4 ELECTRICAL EQUIPMENT PROTECTIVE DEVICES A.C. Circuits Inside Primary containment.................

3/4 8-20 Containment Penetration Conductor Overcurrent Protective Devices and Pre!.ective Devices for Class IE Power Sources Connected to Non-Class 1E Circuits............................................

3/4 8-21 Motor-Operated Valves Thermal Overload Prott - tion........

3/4 8-24 3/4.9 REFUELING OPERATIONS i

3/4.9.1 BORON CONCENTRATION......................................

3/4 9-1 u

l 3/4.9.2 INSTRUMENTATION.........................................

3/4 9-2 l

3/4.9.3 DECAY TIME...............................................

3/4 9-3 SEABROOK - UNIT 1 viii l

l I

l' l --

IYdhEkhk 3/4.6 CONTAINHENT SYSTEMS 3/4.6.1 PRIMARY CONTAINHENT CONTAINMENT INTEGRITY LIMITING CONDITION FOR OPERATION 3.6.1.1 Primary CONTAINMENT INTEGRITY shall be maintained.

APPLICABILITY:

H0 DES 1, 2, 3, and 4.

ACTION:

Without primary CONTAINMENT INTEGRITY, restore CONTAINMENT INTEGRITY within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REjVIREMENTS 4.6.1.1 Primary CONTAINMENT INTEGRITY shall be demonstrated:

e a.

At least once per 31 days by verifying that all penetrations

not capable of being closed by 0PERABLE containment automatic isolation valves and required to be closed during accident conditions are closed by valves, blind flanges, or deactivated automatic valves secured in their positions except for valves that are open under administrative control as permitted by Specification 3.6.3; b.

By verifying that each containment air lock is in compliance with the requirements of Specification 3.6.1.3; and c.

After each closing of each penetration subject to Type B testing, except the containment air locks, if opened following a Type A or B test, by leak rate testing the seal with gas at a pressure not less than P,, 49.6 psig, and verifying that when the measured leakage rate for these seals is added to the leakage rates determined pursuant to Specification 4.6.1.2d. for all other Type B and C penetrations, the combined leakage rate is less than 0.60 L,.

a

Except valves, blind flanges, and deactivated automatic valves which are located inside the containment and are locked, sealed, or otherwise secured in the closed position.

These penetrations shall be verified closed during each C01.0 SHUTDOWN except that such verification need not be performed more often then once per 92 days.

'EABR00K - UNIT 1 3/4 6 1 Amendment No.14

CONTAINHENT SYSTEMS PRIMARY CONTAINMENT CONTAINMENT LEAKAGE LIMITINGCONDLTJONFOROPERATION 3.6.1.2 Containment leakage rates shall be limited to:

a.

An overall integrated leakage rate of:

Less than or equal to L,, 0.15% by weight of the containment air per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months at P,, 49.6 psig; b.

A combined leakage rate of less than 0.60 L, for all penetrations and valves subject to Type B and C tests, when pressurized to P,.

No individual penetration will be allowed to exceed 5% of the total allowed (0.05 L,); and A combined leakage rate of less than or equal to 0.60 L, for all c.

penetrations that are secondary containment bypass leakage paths l

when pressurized to P,.

APPLICA31LITY:

MODES 1, 2, 3, and 4.

ACTION:

With (a) the measured overall integrated containment leakage rate exceeding 0.75 L,, or (b) the measured combined leakage rate for all penetrations and valves subject to Types B and C tests exceeding 0.60 L,, or (c) the combined bypass leakage rate exceeding 0.60 L,, restore the overall integrated leakage rate to less than or equal to 0.75 L, the combined leakage rate for all penetrations and valves subject to Type B and C tests to less than 0.60 L,,

and the combined bypass leakage rate to less than 0.60 L, prior to increasing the Reactor Coolant System temperature ab)ve 200*F.

SEABROOK - UNIT 1 3/4 6-2 Amendment No.14

PAGE INTENTIONALLY BLANK 1

I t

SEABROOK - UNIT 1 3/4 6-5 Amendment No.14

PAGE INTENTIONALLY BLANK SEABROOK - UNIT 1 3/4 6-6 Amendment No.14

CONTAINMENT SYSTEMS DEPRESSURIZATION AND COOLING SYSTEMS SPRAY ADDITIVE SYSTEM LIMITING CONDITION FOR OPERATION 3.6.7.2 The Spray Additive System shall be OPERABLE with:

a.

A spray additive tank containing a volume of between 9420 and 9650 gallons of between 19 and 21% by weight NaOH solution, and b.

Two gravity feed paths each capable of adding NaOH solution from the chemical additive tank to the Refueling Water Storage Tank.

APPLICABILITY:

MODES 1, 2, 3, and 4.

ACTION:

With the Spray Additive System inoperable, restore the system to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; restore the Spray Additive System to OPERABLE status within the next 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

f SURVtitLANCE REQUIREMENTS 4.6.2.2 The Spray Additive System shall be demonstrated OPERABLE:

a.

At least once per 31 days by verifying that each valve (manual, power-operated, or automatic) in the flow path that is not lotked, sealed, or otherwise secured in position is in its correct position; b.

At least once per 6 months by:

1)

Verifying the contained solution volume in the tank, and 2)

Verifying the concentration of the NaOH solution by chemical

analysis, c.

At-least once per 18 months, during shutdown, by verifying that each automatic valve in the flow path actuates to its correct position on a Containment Pressure-Hi-3 test signal.

SEABROOK - UNIT 1 3/4 6-15

- -.. ~. - - - - - _ -.. -... - -

4 4

CONTAINNENT SYSTEMS 3/4.6.3-CONTAINMENT ISOLATION VALVES

' t LIMITING CONDITION FOR OPERATION

3. 6. 3 Each containment isolation-valve shall be OPERABLE.*

APPLICABILITY:

H0 DES 1, 2, 3, and 4.

ACTION:

With one or more of the isolation valve (s) inoperable, maintain at least one isolation valve OPERABLE in each affected penetration that is open and:

a.

Restore the inoperable valve (s) to OPERABLE status within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , or b.

Isolate each affected penetration within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months by use of at least one deactivated automatic valve secured in the isolation position, or c.

Isolate each affected penetration within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months by use of at least one closed manual volve or blind flange; or

d..

Be in at least HOT STANDBY within the next 6'nours and in COLD SHUTDOWN within_the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.6.3.1 Each-containment isolation valve shall be demonstrated OPERABLE prior to returning the valve to service af ter' maintenance, repair, or replacement i

work is. performed on1the valve or its associated actuator.. control, or power circuit by performance of a cycling test and verification of isolation time.

" Locked or sealed closed. valves may be opened on an intermittent basis under l

administrative control.

L L

l L

SEABROOK - UNIT 1 3/4 6-16 Amendment No.14 p:..

u.

CONTAINMENT SYSTEMS CONTAINMENT ISOLATION VALVES SURVEILLANCE REQUIREMENTS 4.6.3.2 Each containment isolation valve shall be demonstrated OPERABLE during l

the COLD SHUTDOWN or REFUELING MODE at least once per 1B months by:

a.

Verifying that on a Phase "A" Isolation test signal, each Phase "A" Isolation valve actuates to its isolation position, b.

Verifying that on a Phase "B" Isolation test signal, each Phase "B" Isolation valve actuates to its isolation position, and c.

Verifying that on a Containment Purge and Exhaust Isolation test signal, each purge and exhaust valve actuates to its isolation position.

4.6.3.3 The isolation time of each power-operated or automatic containment isolation valve shall be determined to be within its limit when tested pursuant to Specification 4.0.5.

SEABROOK - UNIT 1 3/4 6-17 Amendment No. 14

N1 g-l CONTAINMENT SYSTEMS 3/4.6.4 COMBUSTIBLE GAS CONTROL HYDROGEN HONITORS LIMITING CONDITION FOR OPERATION 3.6.4.1 Two '.ane dent containment hydronen monitors shall be OPERABLE.

APPLICABILITY:

MODES 1 and 2.

ACTION:

With one hydrogen monitor innperable, restore the inoperable monitor a.

to OPERABLE status within 30 days or ce in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b.

With both hydrogen monitors inoperable, restore at least one monitor i

to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at least HOT STARFiY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SURVEILLANCE REQUIREMENTS 4.6.4.1 Each hydrogen monitor shall be demonstrated OPERABLE by the performance of a CHANNEL CHECK at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , an ANALOG CHANNEL OPERATIONAL TEST at least once per days, and at least once per 92 days on a STAGGERED TEST BASIS by per'orming CHANNEL CALIBRATION using sample gas containing:

One volume percent nydrogen, balance nitrogen; and e.

b.

Four volume percent hydrogen, balance nitrogen.

SEABROOK - UNIT 1 3/4 6-18 l

CONTAINMENT SYSTEMS BASES 3/4.6.2 DEPRESSURIZATION AND COOLING SYSTEMS 3/4.6.2.1 CONTAINMENT SPRAY SYSTEM The OPERABILITY of the Containment Spray System ensures that containment depressurization and cooling capability will be available in the event of a LOCA.

Tne pressure reduction and resultant lower containment leakage rate are consistent with the assumptions used in the safety analyses.

The two independent Containment Spray Systems provide post-accident cool-ing of the containment atmosphere.

The Containment Spray Systems also provide a mechanism for removing iodine from the containment atmosphere, and, therefore, the time requirements for restoring an inoperable Spray System to OPERABLE status have been maintained consistent with those assigned other inoperable ESF equipment.

3/4.6.2.2 SPRAY ADDITIVE SYSTEM The OPERABILITY of the Spray Additive System ensures that sufficient NaOH is added to the containment spray in the event of a LOCA.

The limits on NaOH volume and concentration ensure a pH value of between 8.5 and 11.0 for the solution recirculated within containment after a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

The contained solution volume limit includes an allowance for solution not usable because of tank discharge line location or other physical _ characteristics.

These assi:mptions are con-sistent with the iodine removal efficiency assumed in the safety analyses.

3/4.6.3 CONTAINMENT ISOLATIr. VALVES The OPERABILITY of the containment 1 solation valves ensures that the containment atmosphere will be isolated f rom the outside environment in the event of a release of radioactive material to the containment atmosphere or pressurization of the containment and is consistent with the requirements of General Design Criteria 54 through 57 of Appendix A to 10 CFR Part 50.

The opening of locked or sealed closed containment isolation valves on an intermittent basis under administrative control includes the following consid-eratioc^:

(1) stationing an operator, who is in constant communication with control room, at the valve controls. (2) instructing this operator to close these valves in an accident situation, and (3) assuring that environmental conditions will not preclude access to close the valves and that this action will prevent the release of radioactivity outside the containment.

Containment isolation within the time limits specified for those isolation valves designed to close automatically ensures that the release of radioactive material to the environment will be consistent with the assumptions used in the analyses for a LOCA.

SEABROOK - UNIT 1 B 3/4 6-3 Amendment No.14

i

'i

' CONTAINMENT SYSTEMS BASES 3/4.6.4 COMBUSTIBLE GAS CONTROL The OPERABILITY of the equipment and systems required for the detection and control of hydrogen gas ensures that this equipment will be available to maintain the hydrogen concentration within conteinment below its flammable

'imit during post-LOCA conditions.

Either recombiner unit is capable of con-

"ing the expected hydrogen generation associated with:

(1) zirconium-water ins, (2) radiolytic decompositicn of water, and (3) corrosion of metals tr containment.

These hydrogen control systems are consistent with the o

y endations of Regulatory Guide 1.7, " Control of Combustible Gas Concentra-n Containment Following a LOCA, March 1971.

.he Hydrogen Mixing Systems are provided to ensure adequate mixing-of the-

.ainment atmosphere-fc11owing a LOCA.

This mixing action will prevent socalized accumulations of hydrogen from exceeding the flammable limit.

3/4.6.5 CONTAINMENT ENCLOSURE BUILDING 3/4.6.5.1 CONTAINMENT ENCLOSURE EMERGENCY AIR CLEANUP SYSTEM-The OPERABILITY of the Containment Enclosure Emergency Air Cleanup System ensures that during LOCA conditions t ritainment vessel leakage into the annulus.

and radioactive materials leaking from engineered safety features equipment, j

from the electrical penetration areas, and from the mechanical penetration j

tunnel, will be filtered through the HEPA filters and charcoal adsorber trains prior to discharge to the atmosphere.

3/4.6.5.2 CONTAINMENT ENCLOSURE BUILDING INTEGRITY CONTAINMENT ENCLOSURE-BUILDING INTEGRITY ensures that the release of radio-i active-materials from the primary containment atmosphere will be restricted to-those leakage paths and associated leak rates assumed in the safety analyses.

This restriction, in conjunction with operation of the Containment Enclosure Emergency Air Cleanup System, will limit the SITE BOUNDARY radiation doses to within the dose guideline values of 10 CFR Part 100 during accident conditions.

1 3/4.6.5.3 CONTAINMENT ENCLOSURE BUILDING STRUCTURAL INTEGRITY

.This limitation ensures that the structural integrity of the containment enclosure building will be maintained comparable to the original design standards for the life of the facility.

Structural _ integrity is required to provide:

(1) protection for the steel vessel from external missiles, (2)-radiation

-shielding in-the event of a LOCA, and (3) an annulus surrounding the primary containment that can be maintained at a negative pressure during accident con-ditions.

A visual inspection is sufficient to demonstrate this capability.

SEABROOK - UNIT B 3/4 6 4 Amendment No.14

.

ML20114C863

Text

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