ML101170676

E-Mail from Masters to Carrion, Observations from Core Boring This Afternoon

ML101170676
Person / Time
Site:	Crystal River
Issue date:	11/09/2009
From:	Masters A NRC/RGN-II/DCI
To:	Robert Carrion NRC/RGN-II
References
FOIA/PA-2010-0116
Download: ML101170676 (2)

Text

Masters, Anthony From: Masters, Anthony Sent: Monday, November 09, 2009 11:29 AM To: Carrion, Robert; Thomas, George Cc: Dan Naus; Lake, Louis

Subject:

RE: observations from core boring this afternoon Categories: Perform Review.

A couple other points of interest:

1. Mr. Bayrd also mentioned to me during my core boring observations, that some of the borescope records prior to Thursday were not done in accordance with their procedures, in that an engineer was supposed to be present. He said they were "re-calibrating" the technician and will be re-doing all the previous borescopes.

2. In my discussions with Mr. Komara, who was responsible for several of the previous IWLIJWE inspections, he mentioned his concern regarding the bulging liner with air voids between the liner and the concrete. He said this has been documented in several of the previous inspection reports, but he understood that it was simply dispositioned as construction/fabrication errors. It seems to me that if the liner was misaligned or bulged during fabrication, the wet concrete would have formed to the misalignment or bulged area and concrete would be in contact with the liner. He stated that soundings have identified voiding between the liner and the concrete. He said their monitoring program is to document and track metal thickness readings to ensure no corrosion on the back side of the liner from water filling the'voids. He said this' bulging was evident from looking at it inside containment and was below the polar crane/ring girder 360 degrees between approximately elevations 180 ft. to 225 ft.

George - have you already reviewed this information? Can you give me a call to let me know your thoughts/

Thanks, Anthony D. Masters, PE Senior Construction Inspector Division of Construction' Inspections U.S. Nuclear Regulatory Commission Region II - Atlanta (404) 562 - 0612 (office phone)

(404) 562 - 0559 (fax)

AnthonqyMasters c nrc. ýov From: Carrion, Robert - .

Sent: Friday, November 06, 2009 10:28 AM To: Masters, Anthony

Subject:

RE: observations from core boring this afternoon Thanks, Anthony.

Bob From: Masters, Anthony (-'

Sent: Thursday, November 05, 2009 6:03 PM To: Carrion, Robert 1.

Cc: Lake, Louis; Thomas, George; Dan Naus; Masters, Anthony

Subject:

observations from core boring this afternoon

Bob, Here is some more information about the two issues I told you about from my observations of the core boring. Pictures are on your thumb drive you gave me this evening and at G:\shared\DRS\SIT\CR3 - Oct 2009 - Containment Bldg Delam\PICTURES\Core Boring Nov 5th 1 - Observed core boring with Progress Energy Project Engineer, Bill Bayrd. The core boring team were Bechtel steel workers (D. Miller, G. Ayala, and M. Clacchella). The cores were being taken under work order 01636782-01 at RBCN0015 (the equipment hatch section between buttresses 3 and 4). The process they use is to first drill 4 small diameter pilot holes around the core location. The area is already marked by CTL using the NDE techniques to identify the steel. They also use a "drillstop" while drilling both pilot holes and core drilling that will turn the drill off if the bit comes in contact with metal. The first pilot hole for core hole #49 encountered steel at about 3.5 inches, they moved slightly closer to the core location and attempted again, and then encountered steel at about 4.5 inches deep. Then moved slightly closer to core center mark and drilled to depth of 12 .inches with out encountering steel. The other 3 pilot holes were good. So, Mr. Bayrd made the decision to reduce from the requested 4" core diameter to 1 inch diameter due to the tight steel restrictions. The core was successful to 12 inches.

Then while driling the first pilot hole for core hole '#46, grease began coming out of the hole at about the 10 inch depth.

When they checked the drillstop, it was not turned on. They turned the drill stop on and stuck the bit back in the hole and it shut off the drill indicating that it did indeed come in contact with steel. It is believed that this hole was drilled into a tendon casing resulting in grease leaking out of hole. No indications on the wall from the NDE indicated a tendon in this location. It was located in panel AZ at about EL 160' and about 84.5 inches from left side of the panel, and about 22.5 inches from the top of the panel, and about 3 inches from the beginning of the transistion to the sloped thickened section at the top of the equipment hatch.

I am not sure if this will result in an NCR or how they will document this.

2 - Mr. Bayrd showed me an large spalled off delam area located in the lower left corner of panel U at Azimuth 165 about EL 180'. It was triangular in shape and was about 4.5 ft wide at the bottom base of the triangle and about 2 ft. tall at the midspan and about 3 inches thick. Mr. Bayrd said he reported it to his management, but was unsure if there was an NCR or any documentation on this. This is a concern because it may further indicate that the surface is poor and that a repair to just epoxy or grout the crack may not be sufficient if the top surface is flaky off.

Anthony D. Masters, PE Senior Construction Inspector Division of Construction Inspections U.S. Nuclear Regulatory Commission Region II - Atlanta (404) 562 - 0612 (office phone)

(404) 562- 0559 (fax)

Anthony.Masters@nrc.gov 2