ML082670267

Request for Additional Information on Condensate Storage Tank Level Amendment

ML082670267
Person / Time
Site:	Diablo Canyon
Issue date:	09/21/2008
From:	Wang A Plant Licensing Branch IV
To:	Schrader K Pacific Gas & Electric Co
Wang, A B, NRR/DORL/LPLIV, 415-1445
References
TAC MD8471, TAC MD8472
Download: ML082670267 (1)

Text

From:

Alan Wang Sent:

Sunday, September 21, 2008 8:31 PM To:

'Ken Schrader'

Subject:

CST RAIs Ken, here are 3 questions from Gardocki. Let me know if you want a call before I issue. Alan SBPB RAI 1 On page 4 of the license amendment request, the condensate storage tank (CST) is described as having a floating roof to minimize oxygen absorption by the stored water. This implies that the roof of the tank would follow the water level as it decreases. However, the plenums extend into the inner volume of the tank and might block the path of the floating roof if water level drops below the tops of the plenums.

In accordance with 10 CFR 50.59, the licensee can make changes to the facility; however, that change should not create a possibility for a malfunction of an structure, system and component (SSC) important to safety with a different result than any previously evaluated.

Describe how the modifications to the CST impact the function of the floating roof, and verify that no new failure mechanisms are created that affect the ability of the CST to provide its safety related function.

SBPB RAI 2 to the license amendment supplemental information (Westinghouse Letter PGE 45) states that the assumed level restoration was reduced from no load programmed level to the Narrow Range lower level tap, in order to reduce the required CST inventory.

10 CFR 50.34 requires the licensee comply with the Standard Review Plan, NUREG 0800, or provide an acceptable alternative. NUREG 0800, Section 13.5.2.1, Operating and Emergency Operating Procedures, states that the Emergency Operating Procedures (EOPs) will be based upon acceptable technical guidelines derived from approved analyses of transients and accidents.

Describe how this change in the restoration level is reflected in the plant operating procedures for loss-of-offsite-power with a natural circulation cooldown.

Verify that any difference in restoration level assumed in the calculation and the plant operating procedures will not have adverse effects on the ability to prevent forming voids in the reactor vessel while cooling the RCS.

SBPB RAI 3 The license amendment request would fully remove the fire water storage tank (FWST) requirements from the Technical Specifications (TS). Afterwards, the licensee intends to remove the FWST from service for approximately 90 days.

In accordance with 10 CFR 50.36 (d)(2)(ii), the licensee is required to provide a TS limiting condition for operation (LCO) for meeting any of four specific criterion.

Confirm that there is no credit for the FWST that would necessitate FWST inclusion in TS, including any license conditions, commitments, or credit in design basis.

E-mail Properties Mail Envelope Properties (419623E8C7444444BF132DA3AE69EDA2105EA954F7)

Subject:

CST RAIs Sent Date: 9/21/2008 8:31:14 PM Received Date: 9/21/2008 8:31:00 PM From: Alan Wang Created By: Alan.Wang@nrc.gov Recipients:

KJSe@pge.com ('Ken Schrader')

Tracking Status: None Post Office:

HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 7993 9/21/2008 Options Expiration Date:

Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: