ML19320B470

Responds to IE Bulletin 80-05 as Applicable to Tanks That Hold Radioactive Liquid or Gases.All Low Pressure Tanks Containing Radioactive Liquids or Gases Either Designed for Full Vacuum or to Prevent Vacuum in Tanks

ML19320B470
Person / Time
Site:	Waterford
Issue date:	06/09/1980
From:	Aswell D LOUISIANA POWER & LIGHT CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
IEB-80-05, IEB-80-5, LPL-14110, NUDOCS 8007100429
Download: ML19320B470 (3)

Text

- _ _ _ _ - _ _ - _ _

7 .L'C-r LOUISIANA 242 oeunosce srneer P O W E R & ' I G H T/ P. a. Box Soos . New ORLEANS. _DUISIANA 70174 * (504) 366-2345 SuSNsysY$

0 L ASWELL Vce Presusent-Power Producton LPL 14110 Q-3-A20.03.14 June 9, 1980 Mr. K. V. Seyfrit, Director U. S. Nuclear Regulattry Commission, Region IV 611 Ryan Plaza, Suite 1000 Arlington, Texas 76012

SUBJECT:

I. E. Bulletin No. 80-05 Docket No. 50/382

" Vacuum Condition Resulting In Damage to Chemical Volume Control System (CVCS) Holdup Tanks" ATIACHMENT: Review of Waterford 3 Code Tanks for Potential Vacuum Damage

Dear Mr. Seyfrit:

We have reviewed I. E. Bulletin No. 80-05 as it applies to tanks that hold radioactive liquid or gases at Waterford 3.

We have the following comments concerning the Gas Surge Tank, Holdup Tanks, Equipment Drain Tank and Spent Resin Tank:

1. Gas Surge Tank We have performed calculations to verify the stresses in the gas surge tank under full vacuum. The stresses remain below code allowable stresses. Our calculations are sufficient to state that the gas surge tank will not be damaged when exposed to full vacuum.

2. Holduo Tanks We have verified that the nitrogen makeup regulator is si::ed to prevent vacuum in the holdup tanks under maximum pumpout conditions.

Pressure in the common vent header is monitored by a pressure indicator in the control room and high and low pressure alarms.

Each tank is monitored by high end low pressure alarms.

3. Equipment Drain Tank We have verified that the nitrogen makeup regulator is suffi-ciently sized to prevent vacuum in the equipment drain tank under maximum pumpout conditions.

80071004N Q >

e Mr. K. V. Seyfrit The tank has a pressure indicator in the control room and high and low pressure alarms.

4. Spent Resin Tank We have identified the potential for overstressing the spent resin tank if it is drained without being vented This problem is being investigated and we will inform you e ur plans for correctio.. by July 11, 1980.

The remaining tanks at Waterford 3 are properly designed for the following reasons:

1. Design includes vents which are not isolable.

2. Tanks are designed for conditions of "0" psia internally, simultaneous with "15" psia external pressure.

3. There is no mechanism for producing a vacuum in the tank:

a. Neither pump nor elevation head is available to produce I the vacuum.

b. Condensation vapors cannot be induced which, if condensed, would produce the vacuum.

All low pressure tanks at Waterford 3, containing radioactive liquids or gases, are either designed for full vacuum or the system is designed to prevent vacuum in the tanks. A table listing these tanks is attached, only the pertinent information is included.

If there are further questions, please advise.

Yours very truly, D. L. Aswell DLA:RRS:meb Attachment ec: U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D.C. 20555

=

Review of Waterford 3 Code Tanks for Potential Vacuum Damage g ISOLATABE DES. PRESS VENT INT / EXT

• CONDENSABM PUMPED VACUUM SYSTEM TANK YES/NO PSIA INPUr YES/NO YES /NO ACTION RCS Quench --

0/15 -- --

None CVCS Volume Control --

0/15 -- -- None Boric Acid Makeup No -- -- -- None Primary Water Storage No -- -- --

None WMS Spent Resin Yes 65/15 No Yes In progress Gas Surge Yes 55/15 Yes Yes None** '

Cas Decay -- --

No No None Waste Concentrate Storage Yes -- No Yes NoneFF Dewatering Yes -- No Yes NoneFF Chemical Waste .Yes --

No Yes None+t Waste No -- -- --

None Waste Condensate No -- -- -- None BHS Flash --

0/15 -- --

None Reactor Drain --

0/15 -- --

None lloldup Yes 13/15 Yes Yes Nonc+

Boric Acid condensate No -- -- --

None Equipment Drain Yes 25/15 No Yes None+

SIS Safety Injection -- --

No No None Refueling Water Storage Noi-FF -- -- --

None

• INT / EXT - This notation means internal pressure & external pressure occurring simultaneously.

• • Calculation has been performed to verify the tank is capable of withstanding full vacuum conditions.

+ lias a nitrogen supply to prevent vacuum in the hold-up tanks.

-l+ lias a ' locked open (LO) vent valve.

+FF Provided with vacuum breakers.

.