ML20236X176

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Amend 91 to License DPR-54,revising Operating Criteria for Control Room & Technical Support Ctr HVAC Sys
ML20236X176
Person / Time
Site: Rancho Seco
Issue date: 12/02/1987
From: Knighton G
Office of Nuclear Reactor Regulation
To:
Shared Package
ML20236X174 List:
References
NUDOCS 8712090033
Download: ML20236X176 (7)
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+ UNITED STATES

. NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555

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SACRAMENTO MUNICIPAL UTILITY DISTRICT DOCKET NO. 50-312 RANCHO SECO NUCLEAR GENERATING STATION AMENDMENT TO FACILITY OPERATING LICENSE Amendment No. 91 License No. DPR-54 1

1. The Nuclear Regulatory Commission (the Commission) has found that:

A. The application for amendment by Sacramento Municipal Utility District (the licensee) dated June 29, 1987 as supplemented October 1, 1987 and requirements of the Atomic Energy Act of 1954, as amended (the Act), rend the Comission's regulations set forth in 10 CFR Chapter I; B. The facility will operate in conformity with the application, the q provisions of the Act, and the regulations of the Comission; C. There is reasonable assurance (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulation; D. The issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public; and 1 E. The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have

, been satisfied.

8712090033 871203 PDR ADOCK 05000312 P PDR

2. Accordingly, the license is amended by changes to the Technical Specifications as indicated in the attachment to this license amendment, and paragraph 2.C.(2) of Facility Operating License No. DPR-54 is hereby amended to read as follows:

(2) Technical Specifications The Technical Specifications contained in Appendices A and B, as revised through Amendment No. 91, are hereby incorporated in the license. The licensee shall operate the facility in accordance with the Technical Specifications.

3. This license amendment is effective as of its date of issuance.

FOR THE NUCLEAR REGULATO Y COMMISSION

$4 U ,

U eorge W. nighton, Di tor Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects Attechment:

Changes to the Technical Specifications Date of Issuance: December 2,1987 l

i 1

December 2, 1987 ATTACHMENT TO LICENSE AMENDMENT NO. 91 FACILITY OPERATING LICENSE NO. DPR-54 DOCKET NO. 50-312 Replace the following pages of the Appendix "A" Technical Specifications with the attached pages. The revised pages are identified by Amendment number and contain vertical lines indicating the area of change.

Remove Insert 4-41 4-41 4-41a 4-41a 4-41b 4-41b 4-41c u . - - _ _ - _ _ _ _ _ _ _ _ _ - _ - _ - _ _ - _ - _ _ - - _ - _

1 RANCHO SECO UNIT 1  ;

TECHNICAL SPECIFICATIONS Surveillance Standards 4.10 CONTROL ROOM / TECHNICAL SUPPORT CENTER EMERGENCY FILTERING SYSTEM Applicability Applies .to the Control Room /TSC Emergency Filtering System and related components.

Objective To verify that this system and its components will be able to perforta their  !

design functions. j i

Specification 4.10.1 The Control Room /TSC Emergency Filtering System shall be:

A. Demonstrated operable at least once per 31 days by initiating flow through thf HEPA filters and charcoal adsorbers.

B. Demonstrated operable at least once per refueling interval, or

  • once every 18 months, whichever occurs first, or af ter each partial or complete replacement of the HEPA' filter bank or charcoal adsorber bank, or following painting, fire, or chemical release in the operating air makeup system, or af ter any structural maintenance on the HEPA filter or charcoal adsorber housings, by:
1. Verifying that the charcoal adsorbers remove > 99.5 percent  ;

of a halogenated hydrocarbon refrigerant test gas when they '

are tested in-place in accordance with ANSI N510 while operating the filter train at a stabilized flow rate of at least 2880 CFM but no greater than 3520 CFM (Make up air flow rate shall not exceed 1760 CFM).

2. Verifying that the HEPA filter banks remove > 99.9 percent of the DOP when they are tested in-place in accordance with ANSI N510 while operating the filter train at stabilized flow rate of at letit 2880 CFM but no greater than 3520 CFM (Make up air flow rate shall not exceed 1760 CFM).
3. Verifying within 31 days after removal that a laboratory analysis of a carbon sample from either at least one test canister or carbon sample removed from one of the charcoal '

adsorbers demonstrates a removal efficiency of >95 percent for radioactive' methyl iodide when the sample is tested in accordance with ASTM D3803 (30*C, 95% R.H.). The carbon samples not obtained from test canisters shall be prepared by either:

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l Amendment No. 39,/0,91 4-41 i

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RANCHO SECO UNIT 1 TECHN! CAL SPECIFICATIONS Specification (Continued) Surveillance Standards

. 4.10.1 B. 3. (a) Emptying one entire bed from a removed adsorber tray, mixing the adsorbent thoroughly, and obtaining samples at least two inches in diameter and with a length equal to the thickness of the bed.

(b) Emptying a longitudinal sample from an adsorber tray, mixing the adsorbent thoroughly, and obtaining samples at least two inches in diameter and with a length equal to the thickness of the bed.

4. Verifying that the pressure drop across the combined HEPA filters.. and charcoal adsorber banks is <6 inches Water Gauge while operating the filter train at a stabilized flow rate of at least 4880 CFM but no greater than 3520 CFM (Make up air flow rate shall not exceed 1760 CFM)

I.

5 Verifying the air makeup system maintains the Control Room /TSC 4t a positive pressure of >0.125 inches W.G.

relative to the outside atmosphere with a stabili:ted make up air flow rate no greater than 1760 CFt!.

6. Verifying a stabilized flow rate thru the essential filtration unit of at least 2880 CFM but no greater than 3520 CFM while operating in the radiological mode when tested in accordance with ANSI N510 C. Demonstrated operable after every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of charcoal adsorber operation by:
1. Verifying within 31 days after removal that a laboratory

. analysis of a carbon sample from either at least one test canister or carbon sample removed from one of the charcoal adsorbers demonstrates a removal efficiency of >95 percent for radioactive methyl iodide.when the sample is tested in accordance with ASTM D3803 (36*C, 95% R.H.). Carbon samples i not obtained from test canisters shall be prepared by either:

I (a) Emptying one entire bed from a removed adsorber tray, mixing the adsorbent thoroughly, and obtaining samples at least two inches in diamefer and with a length equal to the thickness of the bed or, )

(b) Emptying a longitudinal sample from an adsorber tray, mixing the adsorbent thoroughly, and obtaining samples 1 at least two inches in diameter and with a length equal to the thickness of the bed, l

t Amendment bo. M,/0,91 4-41a e.

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< RANCHO SECO UNIT 1

!, TECHNICAL SPECIFICATIONS l Surveillance Standards

( Specification (Continued) 4.10.1 C. 2. After reinstallation of the sampled adsorber tray, per C.1:

(a) Verify that the charcoal adsorbers remove >99.5 percent of a halogenated hydrocarbon refrigerant test gas when they are tested in-place in accordance with ANSI N510 while operating the filter train at a stabilized flow rate of at least 2880 CFM but no greater than 3520 CFM.

(b) Verify that the HEPA filter bank removes >99.9 percent of the DOP when tested in-place in accordance with ANSI N510 while operating the filter train at a stabilized flow rate of at least 2880 CFM but no greater than 3520 CFM.

D. Started on a manual s'gnal and operated for 15 minutes in each 31-day period.

E. Demonstrated operable at least once per refueling interval or once every 18 months, whichever occurs first, by:

1. Verifying that on a high radiation signal, the normal system is automatically isolated and that the emergency filtering system operates.
2. Verifying that on a toxic gas (ammonia excluded)' isolation signal, the system automatically switches into the isolation

, mode of operation with flow through the HEPA filters and charcoal adsorber banks.

3. Verifying that the refrigerant system will maintain the Control Room / Technical Supporp Center temperature at no more than 80 F for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

Bases The purpose of the Control Room /TSC Emergency Filtering System is to limit the particulate and gaseous fission products and toxic products to which the Control Room area and Technical Support Center would be subjected during an

, accidental radioactive or chemical release in or near the Auxiliary Building.

The system is designed with two redundant filter trains each of which consists of a moisture separator, a heater, a high efficiency particulate filter, two banks of charcoal filters, a second high efficiency particulate filter and a booster fan to pressurize the Control Room and Technical Support Center with

, outside air. The prestabilized air flow rate will not exceed 3750 CFM during the 15 minutes preceding stabilized air flow.

Amendment No. 39,7/4,91 4'-41b i

RANCHO SECO UNIT 1 TECHNICAL SPECIFICATIONS Surveillance Standards Specification (Continued)

Since this system is not normally operated, a periodic test is required to ensure its operability when needed. Monthly testircg of this system will show that the system is available for its designed safety action. During this test the system will be observed for unusual or excessive noise or vibration when the fan motors are running. The flow of 1760 cfm makeup air l was selected to limit the maximum radiation dose to occupants of the Control Room /TSC in an accident. For this analysis, each 2-inch charcoal filter was conservatively assumed to provide a DF of 10 for iodine based on laboratory analysis showing >95 percent removal of radioactive methyl iodide. The aggregate 4-inch charcoal depth of the two beds in series provides an overall iodine DF of 100. The HEPA filter is assumed to provide a DF of 100 for particulate.

Refueling interval testing will verify the methyl iodide removal efficiency of the charcoal and the amount of leakage past the charcoal and HEPA filters are at least equal to the design values.

The Essential Filtering System is automatically started and the Normal System isolated when the radiation level in the vicinity of the outside air intakes for the Control Room /TSC Normal Air Conditioning System increases to a predetermined level or when chlorine concentration in the tank farm atmosphere increases.

The testing required af ter painting, fire or chemical release, is not to be interpreted to include minor touch-up painting, housekeeping chemicals and detergents, or other routine maintenance or housekeeping activities.

i Amendment No. 91 4-41c

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