ML22024A020

Breakout Questions - Trp 21 - Closed Treated Water System

ML22024A020
Person / Time
Site:	Oconee
Issue date:	01/19/2022
From:	Angela Wu NRC/NRR/DNRL/NLRP
To:
Wu A, 301-415-2995
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Download: ML22024A020 (3)

Text

Oconee SLRA: Closed Treated Water Breakout Questions SLRA Section: B2.1.12 TRP: 21 Question SLRA SLRA Background / Issue Discussion Question /

Number Section Page (As applicable/needed) Request 1 B2.1.12 B - 111 OE Example 3 discusses a long-term trend of 1. Please discuss any increasing copper and ammonia in the Unit actions taken in 2005 after 1,/2 and Unit 3 Recirculating Cooling Water the conclusion was made System that was suspected to originate from that the source of bacteria under a sludge or slime layer. increasing copper and ammonia was sludge- or This OE is documented on the portal in OE-3 slime-capped bacteria.

AR 2044452_Ammonia in RCW.pdf.

2. Please discuss any Page 1 shows the origin date of 7/11/2016 trending of copper and and a completion date of 11/09/2016. ammonia that was performed between 2005 Page 9 states, The conclusion of sludge and 2016.

capped bacteria was determined during a 2005 INPO assist visit regarding the matter.

2 N/A N/A On the portal under the Selective Leaching AMP: Based on the OE provided, it appears that the RCW

1. OE 2 NCR 02354397 contains the System contains iron final metallurgical evaluation report components but the corrosion (starting on page 69) from Accident coupon testing for the RCW Reconstruction Analysis, PLLC, system does not include iron regarding analysis of nine couplings coupons.

removed from the RCW system.

The three corrosion coupon This report concludes (page 3 of 20) testing memos provided for that 8 of the 9 couplings exhibited the CC System conclude that appreciable corrosion deposits on the corrosion rate for mild their inner diameter surfaces with the steel is zero and the

greatest wall loss being due to corrosion rate for cast iron is localized pitting. Included very low.

photographs document the extensive corrosion. The one corrosion coupon testing memo for the RCW

2. OE 2 NCR 02357223 (page 1 of 30) System concludes that the states that all the malleable iron corrosion rate for mild steel is fittings displayed some level of internal very low (i.e. greater than for corrosion, which was not expected the CC System).

based on the material composition of the fitting and the molybdate 1. Does this point to a concentration of the RCW system. notable difference in corrosion rates Extent of condition also notes that between the CC and other closed-loop chemically- RCW Systems?

controlled systems could be impacted.

2. Why are cast and AR completion notes state there is no malleable iron expected benefit from changing coupons not included current chemical control philosophy at in the RCW System ONS. testing?

---continues---

3. CTW AMP OE on the portal contains 3. Does the occurrence four Metlab files that document the of slime-capped corrosion coupon testing that is bacteria starting in performed on the Component Cooling, 2005 play a role in the Chill Water, and Recirculating Cooling apparently more Water Systems. The CC water corrosive nature of the system uses coupons of Copper, RCW System?

Brass, Carbon Steel, Cast Iron, and Stainless Steel. The CW and RCW 4. Was the RCW System systems only use coupons of Mild ever contaminated Steel, Copper, Brass, and Stainless with raw water?

Steel. Iron coupons are notably missing.