ML20064C019

Proposed Tech Specs Allowing Use of Temporary Alternate Closure Methods for Escape Lock & Containment Wall Penetrations,During Alterations of Core or Movement of Irradiated Fuel within Containment

ML20064C019
Person / Time
Site:	Wolf Creek
Issue date:	02/24/1994
From:	WOLF CREEK NUCLEAR OPERATING CORP.
To:
Shared Package
ML20064C006	List: ML20064C002 ML20064C019
References
NA-94-0024, NA-94-24, NUDOCS 9403090117
Download: ML20064C019 (4)

Text

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. Attachment IV to NA 94-0024 Page 1 of 4 l

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i ATTACHMENT IV PROPOSED TECHNICAL SPECIFICATION CHANGES l

s I 9403090117 940224 l PDR ADOCK 05000482 P PDR

.Att:a chment IV to NA 94-0024

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l l REFUELING OPERATIONS 3/4.9.4 CONTAINMENT BUILDING PENETRATIONS

! LIMITING CONDITION FOR OPERATION l

l l 3.9.4 The containment building penetrations shall be in the following status: ,

a. The equipment door closed and held in place by a minimum of four bolts,

b. A minimum of one door in each airlock is closekand

c. Each penetration providing direct access from the containment atmosphere to the outside atmosphere shall be either:

1) Clo ed b an isolat'n Ive, blind flangehanual valve, or approvgednctional ,egujv[ ale'nl. oQ

2) e capable of being closed by an OPERABLE automatic containment purge isolation valve.

APPLICABILITY: During CORE ALTERATIONS or movement of irradiated fuel within the containment.

ACTION:

With the requirements of the above specification not satisfied, immediately suspend all operations involving CORE ALTERATIONS or movement of irradiated fuelin the containment building.

SURVEILLANCE REQUIREMENTS 4.9.4 Each of the above required containment building penetrations shall be determined to be either in its closed / isolated condition or capable of being l

closed by an OPERABLE automatic containment purge isolation valve within 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> prior to the start of and at least once per 7 days during CORE ALTERATIONS or movement ofirradiated fuelin the containment building by:

a. Verifying the penetrations are in their closed / isolated condition, or i b. Testing the containment purge isolation valves per the applicable l portions of Specification 4 6.3.2. j l

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m. -y An emergency escape hatch temporary closure device is an acceptable replacement for that airlock door.

WOLF CREEK - UNIT 1 3/4 9-4 l

, -Attachtnent IV to NA 94-0024 Page 3 of 4 3/4.9 REFUELING OPERATIONS BASES 3/4 9.1 BORON CONCENTRATION The limitations on reactivity conditions during REFUELING ensure that:

(1) the reactor will remain subcritical during CORE ALTERATIONS, and (2) a uniform boron concentration is maintained for reactivity control in the water volume having direct access to the reactor vessel. The limitation on K, of no greater than 0.95 is sufficient to prevent reactor enticality during refueling operations. The locking closed of the required valves during refueling operations precludes the possibility of uncontrolled boron dilution of the filled portions of the Reactor Coolant System This action prevents flow to the RCS of unborated water by closing flow paths from sources of unborated water. These limitations are consistent with the initial conditions assumed for the boron dilution incident in the safety analyses. .

3/4 9.2 INSTRUMENTATION The OPERABILITY of the Source Range Neutron Flux Monitors ensures that redundant monitoring capability is available to detect changes in the reactivity condition of the core.

3/4 9 3 DECAY TIME The minimum requirement for reactor subcnticality prior to movement of irradiated fuel assemblies in the reactor vessel ensures that sufficient time has elapsed to allow the radioactive decay of the short-lived fission products.

This decay time is consistent with the assumptions used in the safety analyses.

3/4 9.4 CONTAINMENT BUILDING PENETRATIONS The requirements on containment building penetration closure and OPERABILITY ensure that a release of radioactive material within containment will be restricted from leakage to the environment. The OPERABILITY and closure restrictions are sufficient to restrict radioactive rnaterial release from a fuel element rupture based upon the lack of containment pressurization potential while in the REFUELING MODE.

The OPERABILITY of this system ensures the containment purge penetrations will be automatically isolated upon detection of high radiation levels within containment. The OPERABILITY of this system is required to restrict the release of radioactive matenals from the containment atmosphere to the environment.

INSERT "A" 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 conditions dunng CORE ALTERATIONS.

1 WOLF CREEK - UNIT 1 B 3/4 9-1

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. . Attachment IV to NA 94-0024 Page 4 of 4 INSERT "A" Equivalent isolation methods for the emergency personnel escape lock and containment wall penetrations ensure releases from containment are prevented for credible accident scenarios. The isolation techniques must be approved by an engineering evaluation and may include use of a material that can provide a temporary, pressure tight seal capable of maintaining the integrity of the penetrations and airlock to restrict the release of radioactive material from a fuel element rupture.

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