ML20087M926

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Proposed Changes to Tech Spec Table 3.7.4-2 to Add Mechanical Snubber Q1E51G18OR01 to RCIC Sys
ML20087M926
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 03/29/1984
From:
MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML20087M922 List:
References
NUDOCS 8404020168
Download: ML20087M926 (17)
v • d • e


Text

a TABLE 3.7.4-2'(Continued)

SAFETY RELATE 0 MECHANICAL SNUBBERS

  • G

.h SNUBBER SNUBBER q NO. AREA ELEVATION NO. AREA ELEVATION RCIC SYSTEM (Continued) RWCU SYSTEM (Continued)

Q1E5~1G004R07 8 97 Q1G33G002R10 11 102 Q1E51G004R07 8 97 Q1G33G002R10 11 102 Q1E51G004R08 11- 164 Q1G33G002R11 11 102 Q1E51G004R08 11 164 Q1G33G002R12 11 102 Q1E51G004R11 8 97 Q1G33G002R13 11 102 Q1E51G004R13 11 167 Q1G33G002R13 11 102 Q1E51G004R13 11 167 Q1G33G002R14 11 102 Y

  • Q1E51G004R14 11 152 Q1G33G002R14 11 102

-Q1E51G004R14 11 152 Q1G33G002R16 11 112 Y Q1E51G158R03 11 143 Q1G33G002R17 8 125

% Q1E51G158R03 11 143 Q1G33G002R17 8 125 QlESIGl8DRol 8 97 Q1G33G002R18 8 116

k. COMBUSTIBLE GAS CONTROL SYSTEM l

Q1G33G002R19 8 116 Q1G33G002R21 11 102 Q1E61G001R07 11 189 Q1G33G002R2] 11 102 Q1G33G002R22 11 102

1. RWCU SYSTEM Q1G33G002R24 11 Q1G33G011R01 11 140 Q1G33G002CO3 11 113 Q1G33G011R03 11 145 Q1G33G002CO3 11 113 Q1G33G011R03 11 145 Q1G33G002R03 8 136 Q1G33G012R01 11 142 Q1G33G002R03 8 136 Q1G33G012R01 11 142 Q1G33G002R05 11 140 Q1G33G012R02 11 152 Q1G33G002R05 11 140 Q1G33G105R01 11 103 Q1G33G002R08 11 102 Q1G33G105R01 11 103 Q1G33G002R08 11 102 Q1G33G105R01 11 103 Q1G33G002R09 11 102 Q1G33G002R09 11 102 Q1G33G002R09 11 102 8404020168 840329 PDR ADOCK 05000416 P
2. (MP&L P/L Item No. 198)

SUBJECT:

Technical Specification Table 3.3.7.1-1, pages 3/4 3-56 and 3/4 3-58.

DESCRIPTION These changes are proposed in order to revise the minimum 0F CHANGE: number of operable channels required for items 7, 8, and 9 of the Table 3.3.7.1-1 and to revise their associated action statements. The affected items are:

1. Containment and Drywell Ventilation Exhaust Radiation Monitor (Item 7)
2. Fuel Handling Area Ventilation Exhaust Radiation Monitor (Item 8)
3. Fuel Handling Area Pool Sweep Exhaust Radiation Monitor (Item 9)

Currently, a minimum of three channels are required to be operable for these items. This should be revised to "2/ trip system" for each item. The action statements for these items (Actions 74 and 75) should also be revised so that they reflect the trip system logic of these items.

In addition, note "h" will be added to item 6 of Table 3.3.7.1-1 Control Room Ventilation Radiation Monitor, since it is also applicable to this item.

JUSTIFICATION: These revisions are required in order to reficct the design of the affected radiation monitoring systems. The logic is the same for each of the above items and is arranged as follows:

Each item consists of four monitors, with each monitor comprising one channel. The channels are grouped in pairs within two separate trip systems. Both channels in a trip system are required to trip to place the trip system in a tripped condition. With either of the two trip systems in a tripped condition, the associated trip function will be initiated.

The current requirement of three minimum operable channels does not apply to the instrumentation design and its associ-ated two-out-of-two logic. By only requiring three monitors operable, it would be possible to have one trip system inoper-able without entering the "b" section of the applicable action statement. This would be inconsistent with the single-failure criteria, as it applies to the design of these monitor-ing systems. To make the specification consistent with the design configuration, a minimum of two operable channels per trip systen is required. Revision of the applicable action statements is required for clarification and to prevent entry into the "b" section in the event that two channels in different trip syetems are inoperable. This would be overly L/N21sd1 L

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. restrictive, since two operable channels in different trip systems would still_be;available to provide monitoring and initiation of the trip function, if required.

The addition of note "h"-to item 6 is an enhancement, since it is-also' applicable to this item. .

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~ SIGNIFICANT HAZARDS CONSIDERATION:

The proposed changes render the technical specif. cation for the affected instrumentation systems consistent with the

-design configuration of the systems.- They ensurd that adequate monitoring exists.and thatLthe plant is placed in a safe,

' conservative condition ~if such monitoring does not exist. The ,

proposed changes do not:

1. Involve a'significant' increase lin the probability or consequences of an accident previously evaluated, or
2. Create'the possibility of a new or different kind of accident from any accident previously evaluated, or
3. Involve a significant reduction in a margin of safety,

.Therefore, the proposed changes do not involve a significant hazards consideration.

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TABLE 3.3.7.1-1 l RAOIATION MONITORING INSTRUMENTATION 5

c) MINIMUM CHANNELS APPLICA8LE ALARM / TRIP MEASUREMENT

{E l INSTRUMENTATION OPERABLE CONDITIONS SETPOINT RANGE ACTION

1. Component Cooling 5 Water Radiation 5

j

[ Monitor. 1 At all times $1 x 10 cpm /NA 10 to 106cpm 70

2. Standby Service Water System Radiation Monitor 5 6 1/ heat 1, 2, 3,.and* $1 x 10 cpm /NA 10 to 10 cpm 70 exchanger i

train

3. Offgas Pre-treatment Radiation Monitor 1 1, 2 3

55 x 10 mR/hr/HA 1 to 106mR/hr 70

4. Offgas Post-treatment y Radiation Monitor 2(4) 1, 2 51 x 105 cpm (Hi), 10 to 6 10 ,cp, 71 6

) y $1.0 x 10 cpm (H1 Hi Hi)

E 5. Carbon Bed Vault Radiation Monitor 1 1, 2 < 2 x full power 1 to 106mR/hr 72 background /NA

6. Control Room Ventila- (p -2 tion Radiation Monitor 2/tr i p system 1,2,3,5 and** 14 mR/hr/ 10 to 102mR/hr 73

<5 mR/hr#

i

7. Containment and Drywell Ventilation Exhaust I i Radiation Monitor gh) At all times <2.0 mR/hr/ 10

-2 to 102mR/hr 74 5 j P/TmP SYSTEM

<4 mR/hr(b)#

i 8. Fuel Handling Area

} Ventilation Exhaust gh) 1,2,3,5 and** 5 2mR/hr/ 10-2 to 102 mR/hr 75 3

Radiation' Monitor l l 2 /TNP S/SiePI

! $4 mR/hr(d)#

l 9. Fuel Handling Area Pool i Sw'ed e Exhaust Radiation Monitor' M) (c) $ 18 mR/hr/ 10

-2 to 102mR/hr 75 l 2 /TNP. SYSTEM -<35 mR/hr(d)#

E. __ _ _ _

1

, INSTRUMENTATION TABLE 3.3.7.1-1 (Continued)

RADIATION MONITORING INSTRUMENTATION ACTION ACTION 70 -

With the required monitor inoperable, obtain and analyze at least one grab sample of the monitored parameter at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

ACTION 71 -

a. With one of the required monitors inoperable, place t'he inoperable channel in the downscale tripped condition within one hour,
b. With both of the required monitors inoperable, be in at least-HOT SHUTDOWN within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

ACTION 72- With the required monitor inoperable, perform area surveys of the monitored area with portable monitoring instrumentation at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

ACTION 73 -

a. With one of the required monitors in a trip system inoperable, place the inoperable channel in the downscale tripped condition within one hour; restore the inoperable channel to -0PERABLE status within 7 days, or, within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, initiate and maintain operation of at least one control room emergency filtration system in the isolation mode of operation.

l b. With both of the required monitors in a trip system inoperable, l

initiate and maintain operation of at least one control room emergency filtration system in the isolation mode of operation within one hour.

ACTION 74 -

IN 4 TRIP SYSMM l a. Withoneoftherequiredmonitorslinoperable,placethe l inoperable channel in the downscale tripped condition within one hour. , p g,,,

b. Withtwooftherequiredmonitorsjinoperable,isolatethe l

! containment and drywell purge and vent penetrations within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

ACTION 75 -

im A TRIP SYS'NPf I

a. Withoneoftht*requiredmonitorslinoperabl.e,placethe inoperable channel in the downscale tripped condition within one hour. g 4 .rnersYsreH l b. Withtwooftherequiredmonitors/ inoperable,initiateand l maintain operation of at least one standby gas treatment subsystem within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

GRAND GULF-UNIT 1 3/4 3-58 Amendment No.9

.3. (MP&L P/L Items No. 054 and 239)

SUBJECT:

Plant Systems Actuation Instrumentation Technical Specifica-tion 3.3.8 and Table 3.3.8-1.

DESCRIPTION Certain revisions to Technical Specification 3.3.8 and Table OF CHANGE: 3.3.8-1 are proposed to make the Action Statements and minimum operable channel requirements for the containment spray system actuation instrumentation reflect system design requirements.

Other revisions to these specifications are proposed to reformat the information to enhance readability.

1. Technical Specification Action Statement 3.3.8.a is revised to require that, with nonconserva'.ive setpoints, the channel is declared inoperable and action is taken as required by Table 3.3.8-1. (Page 3/4 3-96).
2. Technical Specification Action Statement 3.3.8.b is revised to require that with inoperable channels, the action required-by Table 3.3.8-1 is taken. (Page 3/4 3-96).
3. Technical Specification Action statement 3.3.8.c is revised to transfer its requirements to Table 3.3.8-1.

(Page 3/4 3-96).

4. Table 3.3.8-1 is revised to require two operable drywell pressure-high and reactor vessel water level-low low low level I channels for each containment spray trip system.

Table 3.3.8-1 is also revised to reference the Action Statement number corresponding to each of the actuation instruments.-(Page 3/4 3-98).

5. A continuation page for Table 3.3.8-1 is added that contains the applicable Action Statements. (New page 3/4 3-98a).

' JUSTIFICATION: In the Grand Gulf design, there are two containment spray systems (A & B), each with one trip system. Each trip system consists of the following channels:-

1. Two drywell pressure-high,
2. Two containment pressure-high,
3. Two reactor vessel water level-low low' low, level 1, and
4. One 10 minute' timer (Note: System B has an additional timer to provide a delay of up-to 90 seconds).

Upon receipt of a Loss of. Coolant Accident (LOCA) signal, containment spray actuation: instrumentation starts a timer.

If at the end of the timer cycle (10 minutes) a' containment high pressure signal exists, the Low Pressure Coolant Injection (LPCI-A) flow will be diverted from the reactor to the contain-ment spray function. Ninety seconds.later, LPCI-B flow will divert providing the initiating conditions for containment spray are present.

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One of_the changes to Table 3.3.8-1 involves increasing the minimum number of operable channels per trip system from one to two for the drywell pressure-high and reactor vessel water level-low low low, level 1 instruments. These instruments provide LOCA ECCS initiation signals and isolation actuation signals as listed in Tables 3.3.3-1 and 3.3.2-1, respectively, as well as an initiation signal for the containment spray timers. To be consistent with Tables 3.3.3-1.and 3.3.2-1 and to. reflect LOCA' initiation logic requirements, the minimum operable channels requirement for both instruments is increased from one to two. The present containment pressure-high minimum operable channels requirement should not be changed as only one channel per trip system is required to ensure that a single failure will not disable both containment spray systems.

The changes proposed to the Action Statements in Technical Specification 3.3.8 are made to reflect system design requirements and promote readability. Action Statements a and b.1 do not adequately address the containment spray timers. If inoperable, the timers should not be placed in a tripped condition since this could lead to LPCI flow diversion to the containment spray header prior to the analyzed 10 minutes. The proper action for an inoperable timer is to declare the associated trip system inoperable; this is reflected in Action 131, which is proposed for addition to Table 3.3.8-1. Action Statement b.2 indicates there are two, rather than one, trip systems for each containment spray system. Action Statement b.2 has been corrected and appears as Action 130 b on Table 3.3.8-1.

For readability all action requirements of Specification 3.3~.8

-concerning specific inoperable channels have been moved to Table 3.3.8-1. Proposed Actions a and b now reference Table 3.3.8-1 for the action requirements for inoperable channels.

Action Statement c of Technical Specification 3.3.8 has been moved to Table 3.3.8-1 as Action 132. The reformating of action requirements into Table 3.3.8-1 is purely administrative.

SIGNIFICANT HAZARDS CONSIDERATION:

The proposed changes to the Technical Specifications have been evaluated to involve no significant hazard as defined in 10 CFR 50.92.

The increase in the minimum operable channels for drywell pressure-high and reactor vessel water level, low, low, low

' level 1 promotes consistency.throughout the Technical Specifications.

The changes to the Action Statements are made to reflect system design, to promote readability, and to ensure that the containment spray timers are not placed in a condition that would cause early LPCI diversion.

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All changes proposed here are either purely administrative in nature and constitute no safety impact or represent more conservative operational requirements.

The proposed changes do not:

1. Involve a significant increase in the probability or consequences of an accident previously evaluated, or

.. 2. Create the possibility of a new or different kind of accident from any accident previously evaluated, or

3. Involve a significant reduction in a margin of safety.

Therefore, the proposed changes do not involve a significant hazards consideration.

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t INSTRUMENTATION I 3/4.3.8 PLANT SYSTEMS ACTUATION INSTRUMENTATION LIMITING CONDITION FOR OPERATION 3.3.8 The plant systems actuation instrumentation channels shown in Table 3.3.8-1 shall be OPERA 8LE with their trip setpoints set consistent with the values shown in the Trip Setpoint column of Table 3.3.8-2.

1 APPLICABILITY: As shown in Table 3.3.8-1.

ACTION: W %, MTl@ yred % Table, 3.3.B-I.

a. With a plant system actuation instrumentation channel trip setpoint t less conservative than the value shown in the Allowable Valu column of Table 3.3.8-2, declare the channel inoperable and ..f.:-
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1. With the number of OPERABLE channels less than required by the

' Minimum OPERABLE Channels per Trip System requirement for trip system, place at least one inoperable channel in t ped condition within one hour or declare the ass ated syst inoperable. <

2. With the n r of OPERA 8LE channels less n required by the Minimum OPERAB hannels per Trip Sys requirement for both trip systems, dec the associate ystem inoperable.
c. For the feedwater system / main e trip system:
1. With the number of OP LE chan s one less than required by the Minimum 0PERA8 hannels requi nt, restore the inoperable channel to OPE  : status within 7 day r be in at least STARTUP wit the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
2. With number of OPERABLE channels two less tha quired by inimum OPERABLE Channels per Trip System requir t, estore at least one of the inoperable channels to OPE 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 STARTUP within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

WA oma or more, p\avk sgstems e,c. baba h s+ N m e nt chamals inoge. cow.e., take %e, ACTION reguired ing T alole 3. 3 8 - I .

GRAND GULF-UNIT 1 3/4 3-96 ,

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TABLE 3.3.8-1 PLANT SYSTEMS ACTUATION INSTRUMENTATION N,,

n E MINIMUM APPLICABLE 35 OPERABLE CHANNELS OPERATIONAL j TRIP FUNCTION PER TRIP SYSTEM CONDITIONS A<fr10N

1. CONTAINMENT SPRAY SYSTEM
a. Drywell Pressure-High --t- 2 1,2,3 ,

130 i

b. Containment Pressure-High 1 1,2,3 IS T

, c. Reactor Vessel Water Level-Low Low Low, Level 1 --t- E 1,2,3 130 t'* d. Timers

1) System A 1 1,2,3 131 i' 2) System B 1 1,2,3 138
2. FEEDWATER SYSTEM / MAIN TURBINE TRIP SYSTEM
a. Reactor Vessel Water Level-High, 3 1 13 2.

Level 8

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TABLE 3.3.8-1 (Continued) i FLANT SYSTDtS ACTUATION INSTRUNDITATION ACTION j

ACTION 130 - s. With the number of OPERABLE channels one less than required by the Minimum OPERABLE Channels per Trip System requirement, place the inoperable channel in the tripped l

condition within one hour; otherwise, declare the associated containment spray system inoperable and refer to Technical Specification 3.6.3.2.

! b. With the number of OPERABM channels two less than required by the Minimum CPERABLE chmanals per Trip system requirement, declare the associated containment sprey ,

1 system inoperable and refer to Technical Specification l 3.6.3.2.

ACTION 131 - With the number of OPERABLE channels less than required by the Minfaima OPERABLE Channels per Trip system requirement, restore the channels to OPERABLE status within one hour; otherwise, declare the associated containment sprai, system inoperable and refer to Technical specification 3.6.3.2.

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ACTION 132 - For the feedwater system /msin turbine trip system:

l a. With the number of OPERAILE eh===als one less than l required by the Minimum 0FIRABLE Channels requirement.

l restore the inoperable channel to CFERABLE status within 7 days or be in at least STARTUF within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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b. With the number of OPERABLE channels two less than required by the Mini - OPERABLE Channels per Trip System requirement, restore at least one of the inoperable channels to GFERABLE status with 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 STARTUF within the ment 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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anAun estr - UNIT 1 3/4 3-98a

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SUBJECT:

Automatic Depressurization System (ADS) Trip System Minimum Operable Channel Requirements, Technical Specification Table 3.3.3-1 of Technical Specification 3.3.3.

DESCRIPTION ' Revisions to Technical Specification Table 3.3.3-1 are proposed 0F CHANGEt to achieve consistency between the Technical Specifications and the ADS trip system design.

1. Items A.2 3 and B.2.f of Table 3.3.3-1 should be revised to require two operable manual initiation hand switches per system, instead of one per valve. (Page 3/4 3-25.)
2. . Action-Statement 32 should be revised to change the refer-ence to an individual ADS valve to read " ADS trip system".

(Page 3/4 3-27.)

. JUSTIFICATION: . The Grand Gulf ADS consists of eight safety / relief valves and associated actuation instrumentation. The actuation instru-mentation consists of two trip systems, either of which will t.ctuate all' eight ADS valves. Each ADS trip system includes two: manual handswitches, and actuation signals from both hand switches 'are required to produce an ADS trip system actuation signal.

Presently,'the manual' initiation channels for ADS on Table 3.3.3-1 requires "1/ valve" as the minimum operable channels per trip function. The "1/ valve" requirement refers to hand switches used to actuate individual safety / relief valves, not to the two handswitches per trip system used to actuate the ADS trip system. Items A.2.g and B.2.f on Table 3.3.3-1 should be revised to reflect system level manual ADS initia-tion instead of the present individual valve manual initiation function.

Action Statement 32 on Table 3.3.3-1 for the ADS manual initiation function is no longer applicable upon implementation of the proposed changes.to the minimum. operable channels.

In-the context of the above proposed changes, the reference to an individual ADS valve is now inappropriate and should be

- changed to read " ADS trip system."

SIGNIFICANT HAZARDS CONSIDERATION:

.The' proposed' changes to the Technical Specifications have been evaluated to involve no significant hazard, as defined in 10 CFR.50.92.

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The proposed changes render the information presented in Table 3.3.3-1 and-Action Statement 32 concerning ADS manual initiation consistent with the ADS as-built design. The proposed changes are not considered to:

1. Involve a significant increase in the probability or consequences of an accident previously evaluated; of
2. Create the possibility of a new or different kind of accident from any accident previously evaluated; or n- 3. Involve a significant reduction in a margin of safety.

Therefore, the proposed changes do not involve a significant hazards consideration.

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o TABLE 3.3.3-1 EMERGENCY CORE C0OLING SYSTEM ACTUATION INSTRt#ENTATION h MINIMUM OPERA 8LE APPLICABLE ,

T .

CHAINIELS PER OPERATIONAL E TRIP rUNCTION TRIP FUNCTION (a) C00eITIO15 ACTION y A. DIVISI0ll I TRIP SYSTEM

, 1. mfR-A (LPCI MDDE) & LPCS SYSTEM

a. Reactor Vessel Water Level - Low low low, level 1 2 1,2,3,4*,5* 30

! b. Drywell Pressure - High 2 1,2,3 30 1

c. LPCI Pump A Start Time Delay Relay 1 1, 2, 3, 4*, 5* 31 i d. Manual Initiation 1/ system 1, 2, 3, 4*, 5* 32
2. AUTOMATIC DEPRESSURIZATION SYSTEM TRIP SYSTEM "A"#

l a. Reactor Vessel Water Level - Low Low Low, Level 1 2 1,2,3 30 1 b. Drywell Pressure - High 2 1,2,3 30 l R c. ADS Timer 1 1,2,3 31

!-

  • d. Reactor Vessel Water Level - Low, Level 3 (Permissive) 1 1,2,3 31 l ty e. LPCS Pump Discharge Pressure-High (Permissive) 2 1,2,3 31 y f. LPCI Pump A Discharge Pressure-High (Permissive) 2 1,2,3 31
g. Manual Initiation 1/=?= 1,2,3 32 j

2/sysTsM i B. DIVISION 2 TRIP SYSTEM t

! 1. RHR B & C (LPCI IWDE)

a. Reactor Vessel Water Level - Low, low Low, level 1 2 1, 2, 3, 4*, 5* 30 l
b. Drywell Pressure - High 2 1,2,3 30 l

j c. LPCI Pump B Start Time Delay Relay 1 1, 2, 3, 4*, 5* 31 j d. Manual Initiation 1/ system 1, 2, 3, 4*, 5* 32

2. AUTOMATIC DEPRESSURIZATION SYSTEM TRIP SYSTEM "B"#
a. Reactor Vessel Water Level - Low Low Low, Level 1 1,2,3 30 I- 2(f}

2 II 1,2,3 30

! b. Drywell Pressure - High i c. ADS Timer 1 1,2,3 31

d. Reactor Vessel Water Level - Low, level 3 (Permissive) 1 1,2,3 31
e. LPCI Pump 8 and C Discharge Pressure - High (Permissive) 2/ pump 1,2,3 31 j f. Manual Initiation 1/=?= 1,2,3 32 g l 2./SY5 tem l l  ;

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INSTRUMENTATION TABLE 3.3.3-1 (Continued)

EMERGENCY CORE COOLING SYSTEM ACTUATION INSTRUMENTATION ACTION ACTION 30 - With the number of OPERABLE channels less than required by the Minimum OPERABLE Channels per Trip Function requirement:

a. With one channel inoperable, place the inoperable channel in the tripped condition within one hour" or declare the associated system (s) inoperable.
b. With more than one channel inoperable, declare the associated system (s) inoperable.

ACTION 31 - With the number of OPERABLE channels less than required by the Minimum OPERABLE Channels per Trip Function requirement, declare the associated ADS trip system or ECCS inoperable.

ACTION 32 - With the number of OPERABLE channels less than required by the Minimum OPERABLE Channels per Trip Function requirement, restore the inoperable channel to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> a or declare the associated ADS or ECCS inoperable.

rmp SyswM l ACTION 33 - With the number of OPERABLE channels less than required by the Minimum OPERABLE Channels per Trip Function requirement:

a. For one trip system, place that trip system in the tripped condition within one hour

1

b. For both trip systems, declare the HPCS system inoperable.

l ACTION 34 - With the number of OPERABLE channels less than required by the Minimum OPERABLE Channels per Trip Function requirement, place l at least one inoperable channel in the tripped condition within one hour

! "The provisions of Specification 3.0.4 are not applicable.

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GRAND GULF-UNIT.1 3/4'3-27

5. (MP&L P/L Item No.'285)

SUBJECT:

Chlorine Detection System Technical Specification Surveillance Requirement 4.3.

7.8 DESCRIPTION

The proposed change to Technical Specification Surveillance

.0F CHANGE: Requirement 4.3.7.8 consists of changing the channel calibration frequency of the Chlorine Detection System from at

.least once per 18 months to at least once per 6 months.

(Page 3/4 3-75)~

' JUSTIFICATION: Grand Gulf design consists.of two Chlorine Detection Systems

.which when actuated' starts the control room emergency filtration subsystems in the isolation mode of operation.

i' The proposed change to the Grand Gulf Technical Specifications is consistent with Regulatory Guide 1.95, Revision 1

, recommendations. Changing the calibration frequency to at least once per 6 months is more conservative than the 18 month requirement of the BWR/6 Standard Technical Specifications and the 12 month interval recommended by the Chlorine Detector manufacturer. The performance of a channel calibration at least once per 6 months provides additional assurance that the chlorine Detection System will function reliably. It should be noted that the Regulatory Guide 1.95 recommendation to perform a routine operability check on a weekly basis is already i

satisfied by the current Surveillance Requirement 4.3.7.8 frequency of at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for channel checks.

SIGNIFICANT HAZARDS CONSIDERATION:

The proposed change to the Technical Specifications has been evaluated and determined to involve no significant hazard, as defined in 10 CFR 50.92. The change has been proposed to render the Technical Specification surveillance frequency consistent with Regulatory Guide 1.95 recommendations.. The proposed change will' result in a more stringent surveillance 4- . requirement and constitutes an additional control not presently

- included in the Technical Specifications.

The proposed change does not:

[ 1.- Involve a significant increase in the probability or k consequeneca cf an' accident previously evaluated; or

2. Create ,b< rossibility of a new or.different kind of s ac. d v . - m'any accident previously evaluated; or

'3.- Inm ive a o gnificant reduction in a margin of safety.

Therefore, the prop'osed change does not involve a significant hazards consideration.

-L/Q39cdml.

INSTRUMENTATION w-CHLORINE DETECTION SYSTEM LIMITING CONDITION FOR OPERATION 3.3.7.8 Two independent chlorine detection syst' ems shall be OPERABLE with their. trip setpoints adjusted to actuate at a chlorine concentration of less than or equal to 5. ppm.

APPLICABILITY: All OPERATIONAL CONDITIONS.

ACTION:

a. -With one chlorine detection system inoperable, restore the inoperable detection system to OPERABLE status within 7 days, or within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, initiate and m.aintain operation of at least one control room emergency filtration system subsystem in the isolation mode of operation.
b. With~both chlorine detection systems inoperable, within one hour initiate and maintain operation of at least one control room emer-

.gency filtration system subsystem in the isolation mode of operation.

c. The provisions of Specification 3.0.4 are not applicable.

SURVEILLANCE REQUIREMENTS 4.3.7.8 Each of the above required chlorine detection systems shall be demonstrated OPERABLE by performance of a CHANNEL CHECK at least.once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, a CHANNEL FUNCTIONAL TEST at least once per 31 days and a CHANNEL CALIBRATION at least once per iHF months. l 6

GRAND GULF-UNIT 1 3/4 3-75

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