ML20137J083

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Provides Addl Info Re 851217 Submission of Suppl 2 to Proposed Tech Spec Rev,Deleting Upper Head Injection. Applicability of Tech Specs 3.5.1.1,3.5.1.2 & 3.5.1.3 clarified.Marked-up Tech Specs Encl
ML20137J083
Person / Time
Site: McGuire, Mcguire  Duke Energy icon.png
Issue date: 01/14/1986
From: Tucker H
DUKE POWER CO.
To: Harold Denton, Youngblood B
Office of Nuclear Reactor Regulation
References
NUDOCS 8601220233
Download: ML20137J083 (6)
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Text

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DUKE POWER GOMPANY P.O. Box 33180 CHARLOTTE, N.C. 28242 HAl.H.TUCKE9 TELEPHONE vicereesmswe (704) 373-4531

===== ===rono- January 14, 1986 iMr.]Harol'dMDenton, $ DirdetfoF] .

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: B.'J. Youngblood, Director PWR Project Directorate #4

Subject:

McGuire Nuclear Station Docket Nos. 50-369 and 50-370

Dear Mr. Denton:

Please refer to my letter dated December 17, 1985 which submitted Supplement 2 to proposed technical specification revisic,t. to delete UHI. In order to clarify the contents of this letter, the following are requested:

1. As previously proposed, the " applicability" of Specifications 3.5.1.1, 3.5.1.2, and 3.5.1.3 could be misinterpreted. It is now requested that the applicability formerly noted by footnote, be placed directly in the APPLICABILITY section of each technical specification. Copies of suitably marked pages are attached.
2. As previously proposed, the Bases did not provide sufficient detail as to what modifications were necessary. It is now requested that the portion of the technical justification, which details the actions necessary to the plant to assure conformance with the assumption of the safety analysis, be inserted into the previously proposed Bases.

Copies of the suitably marked pages are attached.

Please feel free to contact us if you require any additional information.

Very trulyjours,

-lM W

.Hal B. Tucker i 8601220233 860114 0ei PDR ADOCK 05000369-RLG/jgm P PDR i ,1 i Attachments xc: Dr. J. Nelson Grace, Reg. Admin. Mr. Dayne Brown, Chief U.S. Nuclear Regulatory Commission Radiation Protection Branch Region II Division of Facilit- Services 101 Marietta Street, NW, Suite 2900 Department of Human aesources Atlanta, Georgia 30323 P.O. Box 1200 Raleigh, North Carolina 27605 Mr. Darl Hood, Project Manager Division of Licensing Mr. W.T. Orders Office of Nuclear Regulatory Commission NRC Resident Inspector Washington, D.C. 20555 McGuire Nuclear Station

3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5.1 ACCUMULATORS COLD LEG INJECTION LIMITING CONDITION FOR OPERATION 3.5.1.1 Each cold leg injection accumulator shall be OPERA 8LE with:

a. The isolation valve open,
b. 687o 73 't 2-A contained borated water volume of between M and 4256 gallons,
c. ,

A boron concentration of between 1900 and 2100 ppm,

d. rer G9 A nitrogen cover pressure of between 430 and 48+ psig, and
e. A water level and pressure channel OPERABLE.

APPLICABILITY: MODES 1, 2, and 3*.

ACTION:

a.

With one accumulator inoperable, except as a result of a closed isolation valve, restore the inoperable accumulator to OPERABLE [

2 status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least H0i STAN08Y within the next 6

thehours and reduce following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.pressurizer pressure to less than 1000 psig within (

)

b. [

With one accumulator inoperable due to the isolation valve being closed, either imediately open the isolation valve or be in at least [

HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less than 1000 psig within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

(

SURVEILLANCE REQUIREMENTS 4.5.1.1.1 Each cold leg injection accumulator shall be demonstrated OPERABLE:

a. At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by:
1) Verifying the contained borated water volume and nitrogen cover pressure in the tanks, and
2) Verifying that each cold leg injection accumulator isolation valve is open.
  • Pressurizer pressure above 1000 psig.

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McGUIRE - UNITS 1 and 2 3/4 5-1 Amendment No.A[(Unit 1)

Amendment No.J8(Unit 2)

3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5.1 ACCUMULATORS COLD LEG INJECTION LIMITING CONDITION FOR OPERATION L

3. 5.1./ Each cold leg injection accumulator shall be OPERABLE with:
a. The isolation valve open, b.

A contained borated water volume of between 8022 and 8256 gallons, c.

A boron concentration of between 1900 and 2100 ppm, d.

A nitrogen cover pressure of between 430 and 484 psig, and

e. A water level and pressure channel OPERABLE. i l

APPLICABILITY: MODES 1, 2, and 3*. 4--

ACTION:

a.  ;

With one accumulator inoperable, except as a result of a closed '

isolation valve, restore the inoperable accumulator to OPERABLE )

k i status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STAN08Y within the next  ;

6 thehours and reduce following pressurizer pressure to less than 1000 psig within (

6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.  ;

)  ;

' 1

b. (

With one accumulator inoperable due to the isolation valve being )

closed, either immediately open the isolation valve or be in at least (

I HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressurizer pressure to less than 1000 psig within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. 2 l

( j SURVEILLANCE REQUIREMENTS 2-4.5.1/.1 Ec.ch cold leg injection accumulator shall be demonstrated OPERABLE:

a. At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by:
1) Verifying the contained borated water volume and nitrogen cover pressure in the tanks, and
2) Verifying that each cold leg injection accumulator isolat*on valve is open. .

I

  • Pressurizer pressure above 1000 psig. (u/// og oro 4./ k /eg v Je 8 ) d 1~ .

McGUIRE - UNITS 1 and 2 3/45-fpy r Amendment No 47(Unit 1) i Amendment No.,28(Unit 2)

l gGENCYCORECOOLINGSYSTEMS UPPER HEAD INJECTION LIMITING CONDITION FOR OPERATION 3

3.5.1./ Each Upper Head Injection Accumulator System shall be OPERABLE with:

a. The isolation valves open,
b. The water-filled accumulator containing a minimum of 1850 cubic feet of borated water having a concentration of between 1900 and 2100 ppm of boron, and
c. The nitrogen bearing accumulator pressurized to between 1206 and 1264 psig.

APPLICABILITY: MODES 1, 2 and 3.8 F j ACTION:

a. With the Upper Head Injection Accumulator System inoperable, except as a result of a closed isolation valve (s), restore the Upper Head Injection Accumulator System to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and reduce pressur- 4 izer pressure to l?ss than 1900 psig within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. [
b. With the Upper Head Injection Accumulator System inoperable due to the isolation valve (s) being closed, either immediately open the isolation valve (s) or be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and g reduce pressurizer pressure to less than 1900 psig within the follow- /

ing 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, p SURVEILLANCE REQUIREMENTS 3

4.5.1.g Each Upper Head Injection Accumulator System shall .A demonstrated OPERABLE:

a. At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by:
1) Verifying the contained borated water volume and nitrogen pressure in the accumulators, and
2) Verifying that each accumulator isolation valve is open.

M ' E' '

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  • Pressurizer Pressure above 1900 A/ / j,

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Amendment No.,47[(Unit 2) l McGUIRE - UNITS 1 and 2 3/4 5-3a Amendment No. 28 (Unit 1)

3/4.5 EMERGENCY CORE COOLING SYSTEMS BASES 3/4.5.1 ACCUMULATORS The OPERABILITY of each Reactor Coolant System (RCS) accumulator ensures that a sufficient volume of borated water will be immediately forced into the reactor core through each of the cold legs in the event the RCS pressure falls below the pressure of the accumulators. This initial surge of water into the core provides the initial cooling mechanism during large RCS pipe ruptures.

The limits on accumulator volume, baron concentration and pressure ensure that the assumptions used for accumulator injection in the safety analysis are met.

, The accumulator power operated isolation valves are considered to be

" operating bypasses" in the context of IEEE Std. 279-1971, which requires that bypasses of a protective function be removed automatically whenever permissive conditions are not met. In addition, as these accumulator isolation valves fail to meet single failure criteria, removal of power to the valves is required.

The limits for operation with an accumulator inoperable for any reason except an isolation valve closed minimizes the time exposure of the plant to a LOCA event occurring concurrent with failure of an additional accumulator which may result in unacceptable peak cladding temperatures. If a closed isolation valve cannot be immediately opened, the full capability of one accumulator is not available and prompt action is required to place the reactor in a mode where this capability is not required.

The original licensing bases of McGuire assumes both the UHI system and the Cold Leg Accumulators function to mitigate postulated accidents. Sub-sequent analyses, documented in "McGuire Nuclear Station, Safety Analysis for UHI Elimination" dated September, 1985, and docketed by Duke letter dated October 2, 1985, support the determination that UHI is no longer required provided the Cold Leg Accumulator volume is adjusted to be consistent with that assumed in the Safety Analsyis.

Accordingly, Specification 3/4.5.1.1 on pages 3/4 5-1, -2 is provided as the planned final condition of the cold leg injection system with water volume and nitrogen cover pressure as assumed in the Safety Analysis.

It is applicable for the conditions of UHI being either physically removed or g ,,,th flowisolated. It has a prerequisite that the cold leg accumulators and discharge paths are consistent with assumptions used in the Safety Analysis. a k95Ab'Q}l Specification 3/4.5.1.2 on page 3/4 5-2a, -2b is the Technical Specification requirements for the Cold Leg Injection with UHI system operable. As this is expected to be an interim condition, the pages have been renumbered with

suffixes a, b. With respect to Technical Specifications for the UHI system, page 3/4 5-3 is provided as the planned final condition of the plant, that being with the UHI system deleted. New page 3/4 5-3c is provided to cover the condition following modification of the cold leg accumulators and dis-

! charge paths. This new requirement is that the isolation valves be closed i

MCGUIRE - UNITS 1 and 2 B 3/4 5-1 l

a . . .

The actions required to align the plant configuration with the safety analyses assumptions are:

1. Replace flow restricting orifices in the Cold Leg Accumulators discharge piping to ensure actual accumulator discharge line resistances are within tolerance bands of ECCS analysis.
2. Reduce the nominal water level in the Cold Leg Accumulators and modify instrumentation, alarm functions, and procedures accordingly.
3. Increase the noninal gas cover pressure in the Cold Leg Accumulators and modify instrumentation, alarm functions, and procedures accordingly.
4. Ensure UHI isolation valves remain closed during operation.

Items 1, 2, 3 constitute modifications required by the phrase

" Cold Leg Accumulator and discharge paths suitably modified" contained in the technical specifications. Item 4 is a requirement that will be implemented by administrative controls and is reflected in Technical Specifi-cation 3/4 5.1.4.

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