AECM-86-0197, Application for Amend to License NPF-29,revising Tech Specs to Delete Control Room Chlorine Detectors & Requirement for Automatic Isolation of Control Room Upon Detection of Chlorine.Fee Paid

Application for Amend to License NPF-29,revising Tech Specs to Delete Control Room Chlorine Detectors & Requirement for Automatic Isolation of Control Room Upon Detection of Chlorine.Fee Paid

ML20206U067
Person / Time
Site:	Grand Gulf
Issue date:	06/26/1986
From:	Kingsley O MISSISSIPPI POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20206U071	List: AECM-86-0197, Application for Amend to License NPF-29,revising Tech Specs to Delete Control Room Chlorine Detectors & Requirement for Automatic Isolation of Control Room Upon Detection of Chlorine.Fee Paid ML20206U074
References
AECM-86-0197, AECM-86-197, TAC-61881, NUDOCS 8607080307
Download: ML20206U067 (8)

Text

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l MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi EmihhiniiddB P. O . B O X 16 4 0, J A C K S O N, MISSISSIPPI 39215-1640 June 26, 1986 O. D. KINGSLEY, JR.

YlCE PRE $10ENT NUCLEAR OPERATIONS U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C. 20555 Attention: Mr. Harold R. Denton, Director

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 File: 0260/0840/L-860.0 Proposed Amendment to the Operating License (PCOL-86/14)

AECM-86/0197 Mississippi Power & Light (MP&L) Company is submitting by this letter proposed changes to the Grand Gulf Technical Specifications deleting the control room chlorine detectors and thus the requirement to automatically isolate the control room upon detection of chlorine. This proposed change is based on the low chlorine concentration which would be expected in the control room from onsite release and on the low probability of a spill on the river in the vicinity of the site.

In accordance with the provisions of 10 CFR 50.30, three (3) signed originals and forty (40) copies of the requested amendment are enclosed. The attachment provides the complete technical justification and discussion to support the requested amendment. This amendment has been reviewed and the Plant Safety Review Committee (PSRC) and the Safety Review accepted Committee by(SRC).

Based on the guidelines presented in 10 CFR 50.92, it is the opinion of MP&L that this proposed amendment involves no significant hazards consideration.

In accordance with the requirements of 10 CFR 170.21, we have determined that the application fee is $150. A remittance of $150 is attached to this letter.

8607090307 860626 Yours ruly, PDR ADOCK 05000416 P PDR 0DK:bms  ;

Attachments: GGNS PCOL-86/14 A i p Ogi cc: (See Next Page) t.M d

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L J16AECM86062501 - 1 Member Middle South Utilities System

AECM-86/0197 Page 2 cc: Mr. T. H. Cloninger (w/a)

Mr. R. B. McGehee (w/a)

Mr. N. S. Reynolds (w/a)

Mr. H. L. Thomas (w/o)

Mr. R. C. Butcher (w/a)

Mr. James M. Taylor, Director (w/a)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Dr. J. Nelson Grace, Regional Administrator (w/a)

U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N. W., Suite 2900 Atlanta, Georgia 30323 Dr. Alton B. Cobb (w/a)

State Health Officer State Board of Health Box 1700 Jackson, Mississipti 39205

.J16AECM86062501 - 2:

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BEFORE THE UNITED STATES NUCLEAR REGULATORY COMMISSION LICENSE N0. NPF-29 t

DOCKET NO. 50-416 IN THE MATTER OF MISSISSIPPI POWER & LIGHT COMPANY-and MIDDLE SOUTH ENERGY, INC.

and SOUTH MISSISSIPPI ELECTRIC POWER ASSOCIATION AFFIRMATION I, 0. D. Kingsley, Jr., being duly sworn, stated that I am Vice President, Nuclear Operations of Mississippi Power & Light Company; that on behalf of Mississippi Power & Light Company, Middle South Energy, Inc., and South Mississippi Electric Power Association I am authorized by Mississippi Power & Light Company to sign and file with the Nuclear Regulatory Commission, this application for amendment of the Operating License of. the. Grand Gulf Nuclear Station; that I signed this application as Vice President, Nuclear Operations of Mississippi Power & Light Company; and-that the statements made and the matters set forth therein are true and correct to th best of my knowledge, information and belief.

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STATE OF MISSISSIPPI COUNTY OF HINDS j l'

SUBSCRIBED AND SWORN T0 before me, a Notary Public, in and for the County and State above named, this 2 M day of. 7t/p/ F , 1986.

(SEAL)  !

N(f4ry Public j My commission expires:

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REMITTANCE ADVtCE CHECK DATE Q6/16[86 VENDOR US NUC REG COMM VENDOR NUMBER 929958 CHECK NO.06-005 6 voU

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Csecx DATE o o, ,, couams cents-06 16 86 $150iOO i U.S. NUCLEAR REGULATORY TO THE COMMISSION f ,.

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SUBJECT:

Technical Specification 3.3.7.8, Surveillance Requirements 4.3.7.8 and 4.7.2.d.2.b and Bases 3/4.3.7.8, pages 3/4 3-79, 3/4 7-6 and B3/4 3-5.

DISCUSSION: The proposed technical specification change deletes the control room chlorine detectors and the requirement to automatically isolate the Control Room upon detection of chlorine. This proposed change is based on the low chlorine concentration which would be expected in the control room from the onsite release and on the low probability of a spill on the river in the vicinity of the site.

The off-site analysis discussed in section 2.2.3.1.2 of -

the updated FSAR sqows the probability of a chlorine accident on the Mississippi River in the vicinity of GGNS is approximately 1.8E-7 per year. Details of this analysis are provided in attachment 1. The results of the on-site analysis are provided in Table 2.2-7 of the FSAR and were originally submitted to the NRC in a [[letter::AECM-83-0308, Responds to IE Bulletin 83-03 Re Check Valve Failures in Raw Water Cooling Sys of Diesel Generators.Three Check Valves in Standby Svc Water Sys Meet Applicable Criteria.Addl Response Will Be Submitted When Valve Verification Completed|letter dated June 7, 1983]]. This analysis showed that following the rupture of one chlorine cylinder, the Control Room chlorine concentration would remain well below the concentration requirements of Regulatory Guide 1.78.

JUSTIFICATION: It is proposed that the GGNS Technical Specification be changed to delete the control room chlorine detectors and thus the automatic isolation of the Control Room upon detection of chlorine.

The deletion of control room chlorine detectors and associated automatic isolation of the Control Room upon detection of chlorine is based on:

(1) the lack of risk from an onsite chlorine accident, and (2) the very low probability of an offsite chlorine accident, ,

(1) On-site Chlorine Storage and Use Liquid chlorine is used or stored in 150 pound cylinders in locations only outside the Unit 1 protected area. The location closest to the Control Room is approximately 225 meters from the Control Building. This complies with the guidance in Regulatory Guide 1.95, which requires liquified chlorine in quantities greater than 20 pounds to be stored at least 100 meters away from the control room or 1,ts fresh air inlets.

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Administrative controls require that:

1. No single'on-site liquid chlorine container will contain more than approximately 150 pounds of chlorine.

2. No more than ten (10) liquid chlorine containers are permitted on-site except during deliveries.

There shall be no more than nine (9) deliveries per calendar year of liquid chlorine to the jobsite.

3. No more than two liquid chlorine containers shall be maintained at any approved usage area except during replenishment.

4. No more than one liquid chlorine container shall c be in service at any approved usage area.

Chlorine containers shall not be manifolded together.

5. All liquid chlorine containers shall be delivered to a GGNS construction warehouse which is located outside Unit 1 protected area for storage until required for usage.

6. Empty chlorine containers shall be returned to the construction warehouse for storage and returned to the vendor.

Analysis of On Site Chlorine Accident Because of the use and delivery arrangements of on site chlorine, the postulated release of a single 150 pound cylinder at the location closest to the Control Room (225 meters) represents a conservative basis for evaluating the effects of an on site chlorine accident.

Such an analysis was performed assuming:

1. Atmospheric stability - Stable, Class F.

2. Wind speed - 1 meter /second.

3. Wind direction - Directly towards the control room  !

air intake from the accident location.

4. Ambient temperature - 250F.

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5. An initial puff release followed by a continuous '

release from the remaining chlorine.

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6. A ground level control room air intake.

7. No control room isolation during the event.

ThisresultsinachlogineconcentrationinsidetheCon-trolRoomof18.jmg/m which is well below the chlorine limit of 45 mg/m allowed by Regulatory Guide 1.78. The results of this analysis are given in Table 2.2-7 of the FSAR.

(2) Offsite Chlorine Accident Probability Study Section 2.2 of the FSAR describes the possible sources of chlorine that could impact control room .

habitability. Chlorine tank ruptures on nearby I highways and the Mississippi River were considered.

Only the barge accident is considered a credible -

threat.

A probability study was performed on the effect on the control room of a chlorine barge accident and subsequent spill on the Mississippi River. Since there were no chlorine spills during the nine year period from 1973 to 1982, a conservative estimate for i

a chlorine release resulting from a barge accident was prepared based on all barge accidents involving spills on the lower Mississippi River for that period.

This data was also used in~ preparing analyses discussed in the FSAR. A probability of 1.8E-7 for an accident involving a chlorine spill on the Mississippi River near GGNS was calculated. This probability is within the acceptance criteria of NRC Standard Review Plan 2.2.3. Attachment 1 "Offsite Chlorine Accident Probability Study" discusses a more detailed discussion of the above.

Based on the low chlorine concentration which would be expected in the Control Room from the onsite release and on the low probability of a spill on the river in the vicinity of the site, it is concluded that a chlorine accident need not be considered to require automatic isolation of the control room air intake. Deletion of the chlorine detectors is thus justified.

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1-SIGNIFICANT HAZARDS CONSIDERATION:

The proposed change does not involve a significant increase in the probability or consequences of an accident.

Deletion of the chlorine detectors would not affect the-probability of an on site chlorine accident. Consequences of an onsite chlorine accident are discussed in Section 2.2.3.1.2 of the FSAR. The results of the analysis indicate that MP&L is in compliance with the requirements of Regulatory Guide 1.95 which requires liquified chlorine

! in quantities greater than 20 pounds to be stored at least i 100 meters away from the control room or its fresh air

inlets. The results also show that with no credit taken forcontrolroomisolation,thechlogineconcentration inside the control room of 18.4 mg/m is below the 45 mg/m 3 allowed by Regulatory Guide 1.78. The results of this

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analysis are given in FSAR Table 2.2-7. The deletion i of the chlorine detectors will not affect the probability of a chlorine barge accident and subsequent spill on the  ;

Mississippi River. The calculated probability is 1.8E-7 per year.

! The proposed change does not create the possibility of a t

new or different kind of accident from any accident evaluated because possible chlorine accidents have been

. considered and because. deletion of the detectors involves '

i no changes in quantities or use of chlorine onsite or ,

offsite. The. accidents as evaluated and presented in_the '

FSAR remain unchanged.

! The proposed change does not involve a significant j reduction in a margin of safety as bounded by the analyses 4

presented in the FSAR. The chlorine concentration inside the control room will remain below the allowed chlorine concentration limits as established by Regulatory Guide 1.78 following deletion of the chlorine detectors. In addition, the probability of an offsite accident (as

, discussed above) is sufficiently low that design-requirements are not required to mitigate the event as specified in Standard Review Plan 2.2.3.

l Therefore,.the proposed change involve no significant i hazards considerations.

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