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Proposed Tech Specs Re Control Rod Block Instrumentation Setpoints & source-range Monitors
	ML20244A844
Person / Time
Site:	Fermi
Issue date:	04/03/1989
From:	; DETROIT EDISON CO.
To:	;
Shared Package
ML20244A672	List: ML20244A844; NRC-89-0039, Application for Amend to License NPF-43,changing Tech Specs Re source-range Monitors to Permit Core off-loading During First Refueling Outage;
References
	NUDOCS 8904180223
	Download: ML20244A844 (8)
	v • d • e

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y INSTRUMENTATION

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SOURCE RANGE MONITORS LIMITING CONDITION FOR OPERATION 3.3.7.6 At least the following source range monitor channels shall be OPERABLE: )

a. In OPERATIONAL CONDITION 2*, three. {

b. In OPERATIONAL CONDITIONS 3 and 4, two.

APPLICABILITY: OPERATIONAL CONDITIONS 2*, 3, and 4.

ACTION:

a. In OPERATIONAL CONDITION 2* with one of the above required source range monitor channels inoperable, restore at least 3 source range monitor channels to OPERABLE status within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

b. In OPERATIONAL CONDITION 3 or 4 with one or more of the above required source range monitor channels inoperable, verify all insertable control rods to be inserted in the core and lock the reactor mode switch in the Shutdown position within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months . .

l SURVEILLANCE REQUIREMENTS l

4.3.7.6 Each of the above required source range monitor channels shall be (- )l demonstrated OPERABLE by:

a. Performance of a:

1. CHANNEL CHECK at least once per: l a) 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months in CONDITION 2*, and b) 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months in CONDITION 3 or 4.

2. CHANNEL CALIBRATION ** at least once per 18 months.

b. Performance of a CHANNEL FUNCTIONAL TEST. 1

1. Within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months prior to moving the reactor mode switch from e the Shutdown position, if not performed within the previous 7 days, and At least once per 31 days. l 2.

c. Verifying, prior to withdrawal of control rods, that the SRM count rate is et i nst C.7*** cps with the detector fully inserted.

2. 3 "With IRM's on range 2 or below.

- Neutron detectors may be excluded from CHANNEL CALIBRATION.

- - "revided :igul-t: nei:: r:ti 1: 1 2. Othe ri:0, 2 p:. ,

1%y bs reduced to 2 0.7 cp prodded s{pa!-to- none do is Z A0*

i FERMI - UNIT 2 3/4 3-64 1

REF.UELING OPERATIONS 3/4.9.2 INSTRUMENTATION LIMITING CONDITION FDR OPERATION 3.9.2 At least 2 source range monitor * (SRM) channels shall be OPERABLE and inserted to the normal aperating level with:

a. Annunciation and continuous visual indication in the control room,

b. One of the required SRM detectors located in the quadrant where CORE ALTERATIONS are being performed and the other required SRM detector located in an adjacent quadrant, and

c. Unless adequate shutdown margin has been demonstrated per Specifica-tion 3.1.1, the " shorting links" shall be removed from the RPS circuitry prior to and during the time any control rod is withdrawn,.

APPLICABILITY: OPERATIONAL CONDITION 5.

ACTION:

With the requirements of the above specification not satisfied, immediately suspend all operations involving CDRE ALTERATIONS and insert all insertable control rods.

SURVEILLANCE ItEQUIREMENTS 4.9.2 Each of the above required SRM channels shall be demonstrated OPERABLE by:

a. At least once per 12 ' hours:

,_ 1. Performance of a CHANNEL CECK, --

2. Verifying the detectors are inserted to the normal operating L / level, and _

3. During CORE ALTERATIONS, verifying that the detector of an OPERABLE SRM . channel is located in the core quadrant where CORE I.LTERATIONS are being performed and another is located in an adjacent quadrant.

"The ese of special-movable d:*dr: i: ring C0,95 ^.LTERATIONS in place-oN nomal-4RM-nuclear dete - is-permissible-a: 1r.; :: these-speci:1 detectors-

: ::=;-c4nd-to-the-nomal-SRM-s4eseits. See Av5 ~'T for ifew bfit ok # -

Not required for control isds removed per Specifwien 3.9.10.1 and 3.9.10.2.

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FERRI - UNIT 2 3/4 9-3

INSERT (PAGE 3/4 9-3) l

Maintenance of a minimum count rate for these channels is not required when sixteen or fewer fuel assenblies, each of which are )

installed in one of the four' positions directly adjacent to one of j the four permanently installed Sm nuclear detectors (four fuel assemblies surrounding each Sm detector), are in the core. Sm minimum count rate requirements apply for any CORE ALTEFATION I involving any other fuel assembly. The use of special movable detectors during CORE ALTERATIONS in place of the normal Sm detectcrs is permissible as long as these special detectors are connected to the normal Sm circuits, i

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REFUELING OPERATIONS i

SURVEILLANCE REQUIREMENTS (Continued)

b. Performance of a CHANNEL FUNCTIONAL TEST:

1. Within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months prior to the start of CORE ALTERATIONS, and "

2. At least once per 7 days.

2:. 3

c. Verifying that the channel count rate is at 1 ::t 0.'* cps:

1. Prior to control rod withdrawal,

2. Prior to and at lea t once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months during CORE ALTERATIONS, and

3. At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

d. Verifying, within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months prior to and at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months during, that the RPS circuitry " shorting links" have been removed during the time any control rod is withdrawn ** unless adequate shutdown margin has demonstrated per Specification 3.1.1.

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- Not required for control rods removed per Specification 3.9.10.1 or 3.9.10.2.

N See /DSGRT for new fochoh Y j

3/4 9-4 Aceadment No. 1 . -)

l FERMI - UNIT 2 l

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INSERT (PAGE 3/4 9-4)

May be reduced to 10.7 CPS provided the signal-to-noise ratio is 1 20. Maintenance of a mininum count rate for these channels is not required when sixteen or fewer fuel assenblies, each of which are installed in one of the four positions directly adja::ent to

_one of the four permanently installed Sm nuclear detectors (four fuel assenblies surrounding each SIN detector), are in the core.

Sm mininum count rate requirements apply for any CORE ALTEPATION involving any other fuel assembly.

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b 3/4.9 ' REFUELING OPERATIONS BASES 3/4.9.1 REACTOR MODE-SWITCH Locking the OPERABLE reactor mo'de switch in the Shutdown or Refuel position, as specified, ensures that the restrictions on control rod withdrawal and' refueling platform movement during the refueling operations are properly activated. These conditions reinforce the refueling procedures and reduce the probability of inadvertent criticality, damage to reactor internals or fuel assemblies, and exposure of personnel to excessive radioactivity.

3/4.9.5 INSTRUMENTATION 5ec B.4se3 joue ef The OPERA 0!LITY cf at least tw; source range monitoes-ensures-that-redundant 2: nit:rin; ::p:bflity i: vcilcb1: t: detect ch:nge: in the rc::titity cendition Of th: ::re.

3/4.9.3 CONTROL R0D POSITION The requirement that all control rein be inserted during other CORE ALTERATIONS ensures that fuel will not be loaded into a cell without a control rod.

{

3/4.9.4 DECAY TIME The minimum requirement for reactor subcriticality prior to fuel movement ensures'that sufficient time has elapsed to allow the radioactive decay of the short lived fission products. This dechy time is consistent with the assump-tions used in the accident analyses.

3/4.9.5 COMMUNICATIONS The requirement for communications capability ensures that refueling station personnel can be promptly informed of significant changes in the facility status or core reactivity condition during movement of fuel within the reactor pressure vessel.

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FERMI - UNIT 2 B 3/4 9-1

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The OPERABILITY of at least two source range nonitors, one loc'3ted in the quadrant where CORE ALTERATIONS are being performed and the other located in an adjacent quadrant, ensures reactivity nonitoring l capability is available to detect changes in the reactivity condition of the core. The Sm in the adjacent quadrant provides a back-up to )j the SM in the quadrant where CORE ALTERATIONS are being performed whenever a continuous multiplying medium exists between the location j of CORE ALTERATIONS and the Sm. The mininum count rate is not '

required when sixteen or fewer fuel assemblies, each directly adjacent to a permanently installed Sm nuclear detector, are in the core.

This provision allows complete core unloading without the use of .)

special movable detectors. During core re-loading up to four ,

irradiated fuel assemblies are placed next to each SM4 detector to l produce greater than the mininum count rate. Fuel loading patterns i are chosen such that each set of contiguous fuel assemblies surrounds )

at least one SR4 detector. This ensures a continuous multiplying ]

medium is established between at least one Sm detector and the !

location of CORE ALTERATIONS thus enhancing the ability of the Sms to respond to any abnormal reactivity increase. ;

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ML20244A844

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