ML20065J188

Proposed Tech Specs Re MSL Radiation Monitor Reactor Scram & MSL Isolation Function

ML20065J188
Person / Time
Site:	Oyster Creek
Issue date:	04/06/1994
From:	GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20065J178	List: ML20065J174 ML20065J185 ML20065J188
References
NUDOCS 9404180066
Download: ML20065J188 (5)

Text

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r transient.. The low condenser vacuum' trip provides a reliable backup to' the turbine trip. Thus, if there is a failure of the turbine trip on low vacuum, t,he reactor would automatically scram at 20 inches Hg. The condenser is capable of receiving bypass steam until 7 inches Hg vacuum thereby mitigating the transient and providing a margin.

The settings to isolate the isolation condenser in the event of a break in the <

steam or condensate lines are based on the predicted maximum flows that these systems woulo experience during operation, thus permitting operation while affording protection in the event of a break. Thesettingscorregpondtoa flow rate of less than three times the normal flow rate of 3.2X10 lb/hr.

Upon initiation of the alternate shutdown panel, this function is bypassed to prevent spurious isolation due to fire induced circuit faults.

The setting of ten times the stack release limit for isolation of the air-ejector offgas line is to permit the operator to perform normal, immediate remedial action if the stack limit is exceeded. The time necessary for this action would be extremely short when considering the annual averaging which is-allowed under 10CFR 20.106, and, therefore, would produce insignificant effects on doses to the public.

Four radiation monitors are provided which initiate isolation of the reactor building-and operation of the standby gas treatment system. Two monitors are located in the ventilation ducts, one is located in the area of the refueling pool and one is located in the reactor vessel head storage area. The trip logic is basically a 1 out of 4 system. Any upscale trip will cause the desired action. Trip settings of 17 mr/hr in the duct and 100 mr/hr on the refueling -floor.are based upon initiating standby gas treatment system so as not to exceed allowed dose rates of 10 CFR 20 at the nearest site boundary. i 5

The SRM upscale of SX10 CPS initiates a rod block so that the chamber can be relocated to a lower flux area to maintain SRM capability as power is 6

increased to the IRM range. . Full scale reading is 1 x 10 CPS. Thigrod block is bypassed in IRM Ranges 8 and higher since a level of 5 x 10 CPS is reached and the SRM chamber is at its fully withdrawn position.

The.SRM downscale rod block of 100 CPS prevents the instrument chamber from I being withdrawn too far from the core during the period that it.is required to i monitor the neutron flux. This downscale rod block is also bypassed in IRM, i 1

l l

0YSTER CREEK 3.1-5 Amendment No: 2, 7, 112, 149, 01/5/71,11/5/71 9404100066 940406 DR ADOCK0500g9

TABLE 3.1.1 PROTECTIVE INSTRUMENTATION REQUIREMENTS (CONT'D)

Reactor Modes Min. No. of Min. No. of in which Function Operable or Instrument -

Must Be Operable Operating Channels Per

[ tripped] Operable Action ,

Function Trio Settina Shutdown Refuel Startuo Run Trio Systems Trio Systems Reauired*'

A. Scram

- 1. Manual Scram X X X X 2 1 Insert control rods

2. High Reactor **

X(s) X(ll) X 2 2 Pressure

3. High Drywell s 3.5 psig X(u) X(u) X 2 2

. Pressure

4. Low Reactor ** X X X 2 2 Water Level

5. a. High Water s 29 gal. X(a) X(z) X(z) 2 2 Level in Scram Discharge Volume North Side

b. High Water 1 29 gal. X(a) X(z) X(z) 2 2 Level in Scram Discharge Volume South Side 6.-Low Condenser 2 20 inches hg. X(b) X . 3(mm)

Vacuum i

7. DELETED OVSTER CREEK 3.1-8 Amendment No.: 20, 44, 63, 73,-.

130, 131, 149, 162 O________________________ _ _ _ _ _ _ _ . _ _ _ _ _ ____ _ _ _ _ _ _ _ _ _ ___

- __ _ _ ____ m

- ~ -

TABLE 3~.1.1' PROTECTIVE INSTRUMENTATION REQUIREMENTS (CONT'D)

Reactor Modes Min. No. of Min. No. of '

in which' Function Operable or Instrument ,

Must Be Operable Operating Channels Per

[ tripped] Operable Action l Function Trio Settina Shutdown Refuel Startuo Run Trio Systems Trio Systems Reouired* '

i

4. High Tempera- 5 Ambient at X(s) X(s) X X 2 2 ture in Main Power + 50 F Steamline-Tunnel

5. Low Pressure ** 2 2 X(cc) X in Main Steam-line

6. DELETED

.C. Isolation condenser High Reactor ** Place

1. X(s) X(s) X(11) X 2 2 Pressure plant in cold shutdown-condition

2. Low-Low 17'2" above X(s) X(s) X- X 2 2 Reactor top of Water active fuel OYSTER CREEK- 3.1-10 Amendment No.: 131

. TABLE 3.1.1 PROTECTIVE INSTRUMENTATION REQUIREMENTS (CONT'D)

Reactor Modes Min. No. of Min. No. of -'

in which Function Operable or Instrument ,

Must Be Operable Operating Channels Per

[ tripped] Operable Action Function Trio Settina Shutdown Refuel Startuo Run Trio Systems Trio Systems Reauired*

6. IRM Upscale s 108/125 fullscale X X 2 3

7. a) water level 5 14 gallons X(z) X(z) X(z) 1 1 per high scram inst.

discharge vol.

volume North b) water level 114 gallons X(z) X(z) X(z) 1 1 per high scram inst.

discharge vol.

volume South L. Condenser Vacuum Pumo Isolation DELETED M. Diesel Generator Time delay after load Seouence energization of Timers relay

1. CRD pump 60 sec 15% X X X X 2(m) 1(n) Consider the_ pump inoperable and comply with Spec.- .

3.4.D (see Note q) i OVSTER CREEK 3.1 Amendment No.: 15, 44, 60, 63, 160

_,,s-

TABLE 4.1.1 Remarks (ADDlies to Instrument Channel Check Calibrate Test Test and Calibration) .

11. APRM Level N/A 1/3d N/A Output adjustment using operational type heat bal~ance during power operation APRM Scram Note 2 1/wk. 1/wk. Using built-in calibration Trips equipment during power operation

12. APRM Rod Blocks Note 2 1/3 mo. 1/mo. Upscale and downscale

13. DELETED

14. High Radiation in Reactor Building Operating Floor 1/s 1/3 mo. 1/wk Using gamma source for calibration Ventilation Exhaust 1/s 1/3 mo. 1/wk. Using gamma source for calibration

15. High Radiation on Air Ejector 1/3 mo. 1/wk. Using built-in calibrution equipment Ejector Off-Gas 1/s Channel check 1 mo. Source check 1/24 mo. Calibration according to

, established station calibration procedures 1/24 mo. Note a

16. IRM Level N/A Each N/A startup IRM Scram * *

• Using built-in calibration equipment OYSTER CREEK 4.1-6 Amendment No.: 63, 71, 108, 141 Change: 7-

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