ML17296A844

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Responds to IE Bulletin 80-05 Re Damage to Chemical Vol Control Sys Tanks.No Addl Vacuum Features Needed for Justification.Lrs Holdup Tanks Cannot Collapse Due to Vacuum
ML17296A844
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 06/27/1980
From: Van Brunt E
ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
ANPP-15756-JMA, IEB-80-05, IEB-80-5, NUDOCS 8007300530
Download: ML17296A844 (4)


Text

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P. 0 BOX 2I 666 PHOENIX'RIZONA 65036 gy 4 P~ 7 Alp s June 27, 1980 ANPP-15756 - JMA/KWG O'I j

Mr. R. H. Engelken, Director U.S. Nuclear Regulatory. Commission Region V 202 Walnut Creek Plaza Q Iq'3.

1990 North California Boulevard Walnut Creek, California 94596

Subject:

NRC I8E Bulletin No. 80-05 dated March 10, 1980 r'he File: D.4.06.1 80-'005-026

Dear Mr. Engelken:

design and construction of PVNGS has been reviewed in regards to NRC I8E Bulletin No. 80-05, Vacuum Conditions Resulting in Damage to Chemical Volume Control System Holdup Tanks.

Our response to Items 1 and 2 of the subject Bulletin are as follows:

1. A review of the systems involved identified the following tanks:
a. Chemical Volume and Control System, Holdup Tank (CVCS HT).

No additional/new vacuum protection measures are needed--

for justification, see Item 2a.

b. Liquid Radwaste System, Holdup Tanks ( LRS HT's). No additional/new vacuum protection features are needed-for justification, see Item 2b.
2. The holdup tanks at PVNGS have adequate vacuum protection features as follows:
a. The CVCS HT is provided with a 100 equivalent feet long l-l/2 inch vent pipe branched into a 500 equivalent feet long 10 inch Refueling Water Tank (RWT) vent header, which is connected into the Fuel Building normal exhaust duct with suction pressure of 890 VtIIIOg'5G'

Mr. R. H. Engelken, Director June 27, 1980 ANPP-15756 - JMA/KWG Page 2 3 inches HqO vacuum. There are no valves in the vent system. TRe total discharge flow from both CVCS HT and RWT is 21580 gpm, which induces 22 inches H20 vacuum in addition to the exhaust duct suction pressure. The total vacuum in both the CVCS HT and RWT can thus be 25 inches H20, which is less than the design pressure of 41.4 inches HgO vacuum. The CVCS Holdup Tank and Refueling Water Tank thus cannot collapse due to vacuum.

b. The LRS HT's are provided with a 190 equivalent feet long 2 inch vent pipe connected with the radwaste building normal exhaust duct with suction pressure of 4 inches H20 vacuum.

There are no valves in the vent system. The HT's total discharge flow rate is 130 gpm, which induces 1.2 inches Hq0 vacuum in addition to the exhaust duct suction pressure.

The total vacuum in the tanks can thus be 5.2 in H20 vacuum, which is less than the HT's collapsing pressure of 14 inches vacuum.

The LRS Holdup Tanks thus cannot collapse due to vacuum.

If you have any questions, please advise.

Very truly yours V~ n~

E. E. Van Brunt, Jr.

APS Vice President, Nuclear Projects ANPP Project Director EEVBJr/KWG/av cc: J. M. Allen A. C. Rogers J. A. Roedel W. F. Quinn F. W. Hartley D. B. Fasnacht W. H. Wilson C. Ferguson NRC Office of Inspection 5 Enforcement Division of Reactor Inspection Programs Washington, D.C. 20555

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